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1 pagesetup
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11 /LucidaSans-Italic f
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(Quanstrom) 2917 1490 w
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(ABSTRACT) 2817 2095 w
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(9) 1681 2375 w
(Fileserver) 1822 2375 w
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(being) 4297 2505 w
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(hardware) 1765 2635 w
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(over) 4392 2635 w
(10Gbps) 4665 2635 w
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(penalty.) 4352 3025 w
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(1.) 720 3415 w
(Introduction) 888 3415 w
11 /LucidaSansUnicode00 f
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(order) 863 3585 w
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(performance) 2354 3585 w
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(case) 1903 3975 w
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(main) 2423 3975 w
(Fileserver) 2743 3975 w
(should) 3312 3975 w
(fail.) 3729 3975 w
(The) 4021 3975 w
(AoE) 4276 3975 w
(targets) 4534 3975 w
(are) 4964 3975 w
(stock) 5188 3975 w
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(SR1521) 720 4105 w
11 /LucidaSansUnicode00 f
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(10Gbps) 2367 4105 w
(Ethernet) 2824 4105 w
(cards.) 3316 4105 w
(This) 3719 4105 w
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(pictured) 4884 4105 w
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(Figure 1.) 720 4235 w
1043 4629 1043 4449 Dl
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5147 4629 3779 4629 Dl
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3779 5529 3779 4989 Dl
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3717 5219 3779 5258 Dl
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(Figure 1) 2853 5793 w
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(maintenance) 4607 1110 w
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11 /LucidaSans-Demi f
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(Basics) 1481 1500 w
11 /LucidaSansUnicode00 f
(The) 720 1670 w
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(Plan) 2553 1670 w
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(cannot) 4940 1670 w
(be) 5341 1670 w
(directly) 720 1800 w
(satisfied) 1174 1800 w
(by) 1684 1800 w
(the) 1870 1800 w
(in-memory) 2101 1800 w
(Block) 2760 1800 w
(Cache) 3103 1800 w
(are) 3486 1800 w
(resolved) 3714 1800 w
(by) 4223 1800 w
(devices.) 4408 1800 w
(The) 4931 1800 w
(Block) 5189 1800 w
(Cache) 720 1930 w
(is) 1078 1930 w
(indexed) 1202 1930 w
(by) 1667 1930 w
(device) 1829 1930 w
(and) 2203 1930 w
(device) 2437 1930 w
(address.) 2811 1930 w
(The) 3335 1930 w
11 /LucidaTypewriter f
(cw) 3570 1930 w
11 /LucidaSansUnicode00 f
(device) 3764 1930 w
(serves) 4138 1930 w
(the) 4512 1930 w
(WORM) 4719 1930 w
(filesys\255) 5100 1930 w
(tem.) 720 2060 w
(It) 1055 2060 w
(is) 1188 2060 w
(comprised) 1335 2060 w
(of) 1952 2060 w
(three) 2119 2060 w
(on-disk) 2456 2060 w
(devices:) 2935 2060 w
(cache,) 3423 2060 w
(read-only) 3820 2060 w
(and) 4404 2060 w
(cached) 4661 2060 w
(WORM.) 5092 2060 w
(These) 720 2190 w
(devices) 1080 2190 w
(are) 1517 2190 w
(known) 1728 2190 w
(as) 2123 2190 w
11 /LucidaTypewriter f
(c) 2283 2190 w
11 /LucidaSansUnicode00 f
(,) 2362 2190 w
11 /LucidaTypewriter f
(w) 2440 2190 w
11 /LucidaSansUnicode00 f
(,) 2519 2190 w
(and) 2597 2190 w
11 /LucidaTypewriter f
(cw) 2838 2190 w
11 /LucidaSansUnicode00 f
(.) 2996 2190 w
(All) 3109 2190 w
(Blocks) 3292 2190 w
(have) 3674 2190 w
(a) 3965 2190 w
11 /LucidaTypewriter f
(w-address) 4069 2190 w
11 /LucidaSansUnicode00 f
(and) 4823 2190 w
(a) 5064 2190 w
(cache) 5169 2190 w
(state.) 720 2320 w
(Blocks) 1092 2320 w
(not) 1471 2320 w
(in) 1687 2320 w
(the) 1827 2320 w
(cache) 2038 2320 w
(are) 2381 2320 w
(state) 2589 2320 w
11 /LucidaTypewriter f
(none) 2890 2320 w
11 /LucidaSansUnicode00 f
(.) 3206 2320 w
(Freshly) 3316 2320 w
(written) 3735 2320 w
(blocks) 4149 2320 w
(are) 4533 2320 w
(state) 4741 2320 w
11 /LucidaTypewriter f
(write) 5042 2320 w
11 /LucidaSansUnicode00 f
(.) 5437 2320 w
(Blocks) 720 2450 w
(on) 1115 2450 w
(the) 1306 2450 w
11 /LucidaTypewriter f
(w) 1534 2450 w
11 /LucidaSansUnicode00 f
(device) 1670 2450 w
(that) 2065 2450 w
(are) 2333 2450 w
(rewritten) 2558 2450 w
(are) 3096 2450 w
(state) 3321 2450 w
11 /LucidaTypewriter f
(dirty) 3639 2450 w
11 /LucidaSansUnicode00 f
(.) 4034 2450 w
(A) 4161 2450 w
11 /LucidaSansUnicode20 f
(\034) 4294 2450 w
11 /LucidaSansUnicode00 f
(dump,) 4335 2450 w
11 /LucidaSansUnicode20 f
(\035) 4678 2450 w
11 /LucidaSansUnicode00 f
(a) 4776 2450 w
(permanent) 4894 2450 w
(snapshot) 720 2580 w
(of) 1248 2580 w
(the) 1398 2580 w
(filesystem,) 1611 2580 w
(is) 2229 2580 w
(taken) 2359 2580 w
(by) 2697 2580 w
(converting) 2864 2580 w
(modified) 3469 2580 w
(blocks) 3984 2580 w
(to) 4369 2580 w
(state) 4518 2580 w
11 /LucidaTypewriter f
(dump) 4820 2580 w
11 /LucidaSansUnicode00 f
(.) 5136 2580 w
(This) 5247 2580 w
(process) 720 2710 w
(takes) 1178 2710 w
(just) 1509 2710 w
(a) 1754 2710 w
(few) 1862 2710 w
(seconds.) 2097 2710 w
(Other) 2649 2710 w
(activity) 2999 2710 w
(on) 3424 2710 w
(the) 3607 2710 w
(Fileserver) 3826 2710 w
(is) 4386 2710 w
(halted) 4522 2710 w
(during) 4903 2710 w
(the) 5301 2710 w
(dump.) 720 2840 w
(Copying) 1139 2840 w
(takes) 1616 2840 w
(place) 1940 2840 w
(in) 2260 2840 w
(the) 2400 2840 w
(background) 2611 2840 w
(and) 3286 2840 w
(does) 3524 2840 w
(not) 3818 2840 w
(impact) 4034 2840 w
(the) 4435 2840 w
(performance) 4646 2840 w
(of) 5364 2840 w
(the) 720 2970 w
(Fileserver.) 932 2970 w
(Once) 1555 2970 w
(state) 1868 2970 w
11 /LucidaTypewriter f
(dump) 2170 2970 w
11 /LucidaSansUnicode00 f
(blocks) 2527 2970 w
(are) 2912 2970 w
(copied) 3121 2970 w
(to) 3517 2970 w
(the) 3666 2970 w
(WORM,) 3878 2970 w
(their) 4299 2970 w
(state) 4588 2970 w
(is) 4890 2970 w
(changed) 5020 2970 w
(to) 720 3100 w
11 /LucidaTypewriter f
(read) 866 3100 w
11 /LucidaSansUnicode00 f
(or) 1220 3100 w
11 /LucidaTypewriter f
(none) 1370 3100 w
11 /LucidaSansUnicode00 f
(,) 1686 3100 w
(if) 1759 3100 w
(it) 1870 3100 w
(is) 1980 3100 w
(dropped) 2105 3100 w
(from) 2592 3100 w
(the) 2884 3100 w
(cache.) 3092 3100 w
(The) 3502 3100 w
(copying) 3738 3100 w
(phase) 4192 3100 w
(of) 4545 3100 w
(any) 4690 3100 w
(number) 4913 3100 w
(of) 5364 3100 w
(dumps may overlap.) 720 3230 w
(The) 720 3400 w
(implemented) 962 3400 w
(Fileserver) 1706 3400 w
(has) 2261 3400 w
(a) 2489 3400 w
(Block) 2593 3400 w
(Cache) 2919 3400 w
(of) 3285 3400 w
(402,197) 3436 3400 w
(8192-byte) 3929 3400 w
(blocks) 4542 3400 w
(\(3137MB\),) 4930 3400 w
(a) 720 3530 w
(cache) 888 3530 w
(device,) 1298 3530 w
11 /LucidaTypewriter f
(e565.0) 1778 3530 w
11 /LucidaSansUnicode00 f
(,) 2252 3530 w
(of) 2394 3530 w
(3,276,800) 2609 3530 w
(blocks) 3268 3530 w
(\(25GB\)) 3718 3530 w
(and) 4177 3530 w
(a) 4481 3530 w
(WORM) 4648 3530 w
(device,) 5099 3530 w
11 /LucidaTypewriter f
({e565.1e545.1}) 720 3660 w
11 /LucidaSansUnicode00 f
(,) 1826 3660 w
(of) 1917 3660 w
(1.5TB.) 2081 3660 w
(The) 2514 3660 w
(WORM) 2770 3660 w
(device) 3172 3660 w
(is) 3567 3660 w
(the) 3712 3660 w
(loose) 3940 3660 w
(mirror) 4281 3660 w
(of) 4674 3660 w
(AoE) 4839 3660 w
(targets) 5098 3660 w
11 /LucidaTypewriter f
(e565.1) 720 3790 w
11 /LucidaSansUnicode00 f
(and) 1239 3790 w
11 /LucidaTypewriter f
(e545.1) 1482 3790 w
11 /LucidaSansUnicode00 f
(.) 1956 3790 w
(Writes) 2071 3790 w
(are) 2447 3790 w
(preformed) 2660 3790 w
(on) 3267 3790 w
(the) 3446 3790 w
(mirrored) 3661 3790 w
(devices) 4172 3790 w
(sequentially) 4610 3790 w
(but) 5294 3790 w
(data) 720 3920 w
(is) 988 3920 w
(read) 1112 3920 w
(from) 1385 3920 w
(the) 1676 3920 w
(first) 1883 3920 w
(device) 2134 3920 w
(only.) 2508 3920 w
(Thus) 2838 3920 w
(the) 3135 3920 w
(wireless) 3342 3920 w
(connection) 3808 3920 w
(which) 4430 3920 w
(limits) 4776 3920 w
(dumps) 5108 3920 w
(to ~1MB/s is not) 720 4050 w
(part) 1643 4050 w
(of) 1894 4050 w
(the) 2037 4050 w
(client) 2243 4050 w
11 /LucidaSansUnicode20 f
(\031) 2534 4050 w
11 /LucidaSansUnicode00 f
(s I/O) 2569 4050 w
(path.) 2871 4050 w
(The) 720 4220 w
(WORM) 954 4220 w
(filesystem is fully described in [1], [2] and [3].) 1334 4220 w
11 /LucidaSans-Demi f
(3.) 720 4480 w
11 /LucidaSansUnicode20 f
(\034) 888 4480 w
11 /LucidaSans-Demi f
(Standby) 929 4480 w
11 /LucidaSansUnicode20 f
(\035) 1385 4480 w
11 /LucidaSans-Demi f
(Mode) 1461 4480 w
11 /LucidaSansUnicode00 f
(It) 720 4650 w
(is) 861 4650 w
(not) 1017 4650 w
(possible) 1261 4650 w
(use) 1772 4650 w
(both) 2026 4650 w
(Fileservers) 2339 4650 w
(at) 2975 4650 w
(the) 3146 4650 w
(same) 3386 4650 w
(time.) 3736 4650 w
(Both) 4112 4650 w
(will) 4421 4650 w
(try) 4671 4650 w
(to) 4883 4650 w
(allocate) 5060 4650 w
11 /LucidaTypewriter f
(w-addresses) 720 4780 w
11 /LucidaSansUnicode00 f
(without) 1647 4780 w
(respect) 2107 4780 w
(to) 2556 4780 w
(the) 2721 4780 w
(other.) 2949 4780 w
(To) 3359 4780 w
(solve) 3552 4780 w
(this) 3883 4780 w
(problem) 4137 4780 w
(a) 4640 4780 w
(configuration) 4758 4780 w
(item) 720 4910 w
(and) 999 4910 w
(command,) 1239 4910 w
(both) 1841 4910 w
(named) 2129 4910 w
11 /LucidaTypewriter f
(dumpctl) 2534 4910 w
11 /LucidaSansUnicode00 f
(were) 3130 4910 w
(added.) 3427 4910 w
(The) 3870 4910 w
(main) 4112 4910 w
(Fileserver) 4418 4910 w
(is) 4973 4910 w
(config\255) 5104 4910 w
(ured) 720 5040 w
(with) 1006 5040 w
11 /LucidaTypewriter f
(dumpctl) 1274 5040 w
(yes) 1913 5040 w
11 /LucidaSansUnicode00 f
(and) 2192 5040 w
(the) 2432 5040 w
(backup) 2645 5040 w
(Fileserver) 3074 5040 w
(is) 3628 5040 w
(configured) 3757 5040 w
(with) 4374 5040 w
11 /LucidaTypewriter f
(dumpctl) 4641 5040 w
(no) 5279 5040 w
11 /LucidaSansUnicode00 f
(.) 5437 5040 w
(To) 720 5170 w
(prevent) 894 5170 w
(writes,) 1336 5170 w
(attaches) 1730 5170 w
(may) 2214 5170 w
(be) 2472 5170 w
(disallowed.) 2642 5170 w
(In) 3316 5170 w
(the) 3455 5170 w
(event) 3665 5170 w
(that) 3994 5170 w
(the) 4244 5170 w
(Fileserver) 4454 5170 w
(fails,) 5005 5170 w
(the) 5301 5170 w
(command) 720 5300 w
11 /LucidaTypewriter f
(dumpctl) 1293 5300 w
(yes) 1937 5300 w
11 /LucidaSansUnicode00 f
(is) 2221 5300 w
(executed) 2356 5300 w
(on) 2890 5300 w
(the) 3072 5300 w
(backup) 3290 5300 w
(Fileserver) 3724 5300 w
11 /LucidaSansUnicode20 f
(\031) 4236 5300 w
11 /LucidaSansUnicode00 f
(s) 4271 5300 w
(console.) 4374 5300 w
(And) 4899 5300 w
(if) 5159 5300 w
(dis\255) 5279 5300 w
(abled, attaches are) 720 5430 w
(allowed.) 1767 5430 w
(While) 720 5600 w
(the) 1049 5600 w
(backup) 1260 5600 w
(Fileserver) 1687 5600 w
(is) 2239 5600 w
(running,) 2367 5600 w
(it) 2859 5600 w
(will) 2972 5600 w
(not) 3193 5600 w
(see) 3409 5600 w
(the) 3629 5600 w
(new) 3841 5600 w
(data) 4097 5600 w
(written) 4370 5600 w
(by) 4785 5600 w
(the) 4952 5600 w
(dump) 5164 5600 w
(process) 720 5730 w
(on) 1168 5730 w
(the) 1340 5730 w
(main) 1547 5730 w
(Fileserver.) 1846 5730 w
(The) 2464 5730 w
(backup) 2699 5730 w
(Fileserver) 3122 5730 w
(must) 3670 5730 w
(be) 3973 5730 w
(halted) 4140 5730 w
(each) 4509 5730 w
(day) 4792 5730 w
(after) 5015 5730 w
(the) 5301 5730 w
(dump) 720 5860 w
(on) 1093 5860 w
(the) 1293 5860 w
(Fileserver) 1529 5860 w
(and) 2106 5860 w
(the) 2369 5860 w
(command) 2605 5860 w
11 /LucidaTypewriter f
(recover) 3195 5860 w
(main) 3857 5860 w
11 /LucidaSansUnicode00 f
(must) 4239 5860 w
(be) 4572 5860 w
(typed) 4769 5860 w
(at) 5133 5860 w
(the) 5301 5860 w
11 /LucidaTypewriter f
(config) 720 5990 w
11 /LucidaSansUnicode00 f
(prompt.) 1240 5990 w
(This) 1749 5990 w
(will) 2020 5990 w
(cause) 2247 5990 w
(the) 2596 5990 w
(cache) 2812 5990 w
(to) 3160 5990 w
(be) 3313 5990 w
(flushed) 3489 5990 w
(and) 3930 5990 w
(the) 4173 5990 w
(filesystem) 4389 5990 w
(to) 4975 5990 w
(be) 5128 5990 w
(ini\255) 5304 5990 w
(tialized from the) 720 6120 w
(new) 1643 6120 w
(dump.) 1893 6120 w
11 /LucidaSans-Demi f
(4.) 720 6380 w
(Changed) 888 6380 w
(Assumptions) 1423 6380 w
11 /LucidaSansUnicode00 f
(In) 720 6550 w
(the) 873 6550 w
(fifteen) 1097 6550 w
(odd) 1497 6550 w
(years) 1755 6550 w
(since) 2089 6550 w
(the) 2416 6550 w
(Fileserver) 2640 6550 w
(was) 3205 6550 w
(developed,) 3460 6550 w
(a) 4097 6550 w
(few) 4211 6550 w
(of) 4452 6550 w
(its) 4613 6550 w
(assumptions) 4796 6550 w
(have) 720 6680 w
(ceased) 1004 6680 w
(to) 1406 6680 w
(hold.) 1550 6680 w
(The) 1892 6680 w
(most) 2127 6680 w
(obvious) 2429 6680 w
(is) 2881 6680 w
(the) 3005 6680 w
11 /LucidaTypewriter f
(worm) 3212 6680 w
11 /LucidaSansUnicode00 f
(device) 3564 6680 w
(is no longer a) 3937 6680 w
(WORM. Even if) 4703 6680 w
(we) 720 6810 w
(were) 903 6810 w
(to) 1193 6810 w
(use) 1337 6810 w
(WORM) 1560 6810 w
(storage,) 1942 6810 w
(disk) 2414 6810 w
(space) 2672 6810 w
(is) 3013 6810 w
(inexpensive) 3138 6810 w
(enough) 3810 6810 w
(that) 4248 6810 w
(it) 4496 6810 w
(would) 4606 6810 w
(be) 4964 6810 w
(practi\255) 5132 6810 w
(cal) 720 6940 w
(to) 914 6940 w
(keep) 1067 6940 w
(an) 1369 6940 w
(entire) 1543 6940 w
(copy) 1897 6940 w
(of) 2190 6940 w
(the) 2342 6940 w
(WORM) 2557 6940 w
(on) 2946 6940 w
(magnetic) 3125 6940 w
(storage) 3659 6940 w
(for) 4103 6940 w
(performance) 4300 6940 w
(reasons.) 5022 6940 w
(This) 720 7070 w
(means) 990 7070 w
(that) 1384 7070 w
(the) 1640 7070 w
(cache) 1857 7070 w
(and) 2206 7070 w
(the) 2450 7070 w
(WORM) 2667 7070 w
(devices) 3058 7070 w
(have) 3498 7070 w
(the) 3792 7070 w
(same) 4009 7070 w
(performance.) 4336 7070 w
(There\255) 5130 7070 w
(fore) 720 7200 w
(it) 997 7200 w
(no) 1132 7200 w
(longer) 1329 7200 w
(makes) 1733 7200 w
(sense) 2140 7200 w
(to) 2506 7200 w
(copy) 2676 7200 w
(blocks) 2987 7200 w
(in) 3393 7200 w
(state) 3555 7200 w
11 /LucidaTypewriter f
(Cread) 3878 7200 w
11 /LucidaSansUnicode00 f
(to) 4334 7200 w
(the) 4503 7200 w
(cache) 4735 7200 w
(device.) 5099 7200 w
cleartomark
showpage
saveobj restore
%%EndPage: 2 2
%%Page: 3 3
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3 pagesetup
11 /LucidaSansUnicode00 f
(Blocks) 720 850 w
(in) 1110 850 w
(state) 1261 850 w
11 /LucidaTypewriter f
(Cread) 1573 850 w
11 /LucidaSansUnicode00 f
(have) 2019 850 w
(been) 2318 850 w
(read) 2630 850 w
(from) 2918 850 w
(the) 3224 850 w
11 /LucidaTypewriter f
(worm) 3446 850 w
11 /LucidaSansUnicode00 f
(device) 3813 850 w
(but) 4202 850 w
(not) 4431 850 w
(modified[3].) 4659 850 w
(A) 5396 850 w
(new) 720 980 w
(option,) 970 980 w
11 /LucidaTypewriter f
(conf.fastworm) 1384 980 w
11 /LucidaSansUnicode00 f
(, inhibits copying these) 2411 980 w
(blocks to the) 3690 980 w
(disk) 4418 980 w
(cache.) 4674 980 w
(A) 720 1150 w
(less) 832 1150 w
(obvious) 1074 1150 w
(difference) 1526 1150 w
(is) 2100 1150 w
(in) 2224 1150 w
(the) 2360 1150 w
(structure) 2567 1150 w
(of) 3085 1150 w
(the) 3229 1150 w
(cache.) 3436 1150 w
(The) 3845 1150 w
(cache) 4081 1150 w
(device) 4421 1150 w
(is) 4796 1150 w
(structured) 4921 1150 w
(as) 720 1280 w
(a) 880 1280 w
(hash) 984 1280 w
(table.) 1280 1280 w
(The) 1658 1280 w
(hash) 1900 1280 w
(function) 2196 1280 w
(is) 2680 1280 w
(simply) 2811 1280 w
(modulo) 3202 1280 w
(the) 3650 1280 w
(number) 3864 1280 w
(of) 4321 1280 w
(hash) 4472 1280 w
(lines) 4768 1280 w
(and) 5061 1280 w
(the) 5301 1280 w
(lines) 720 1410 w
(are) 1019 1410 w
(written) 1236 1410 w
(sequentially) 1659 1410 w
(to) 2348 1410 w
(disk.) 2505 1410 w
(If) 2845 1410 w
(we) 2967 1410 w
(let) 3163 1410 w
11 /LucidaSans-Italic f
(n) 3347 1410 w
11 /LucidaSansUnicode00 f
(be) 3464 1410 w
(the) 3644 1410 w
(number) 3865 1410 w
(of) 4329 1410 w
(rows) 4487 1410 w
(and) 4790 1410 w
11 /LucidaSans-Italic f
(l) 5038 1410 w
11 /LucidaSansUnicode00 f
(be) 5120 1410 w
(the) 5301 1410 w
(number of) 720 1540 w
(columns in our hash, he) 1312 1540 w
(function is) 2634 1540 w
9 /LucidaTypewriter f
(row) 1268 1710 w
(=) 1528 1710 w
(w) 1658 1710 w
(%) 1788 1710 w
(rows) 1918 1710 w
(c) 1268 1820 w
(=) 1398 1820 w
(column) 1528 1820 w
(+) 1983 1820 w
(row*n,) 2113 1820 w
11 /LucidaSansUnicode00 f
(the) 720 2010 w
(blocks will) 926 2010 w
(be) 1521 2010 w
(linearized onto the) 1687 2010 w
(disk) 2732 2010 w
(in the) 2988 2010 w
(following order) 3329 2010 w
9 /LucidaSansUnicode00 f
(0) 1268 2180 w
(,) 1332 2180 w
9 /LucidaSans-Italic f
(n) 1368 2180 w
9 /LucidaSansUnicode00 f
(,) 1431 2180 w
(2) 1467 2180 w
9 /LucidaSans-Italic f
(n) 1531 2180 w
9 /LucidaSansUnicode00 f
(,) 1594 2180 w
9 /LucidaSans-Italic f
(.) 1630 2180 w
9 /LucidaSansUnicode00 f
(..) 1659 2180 w
(,) 1724 2180 w
(\() 1760 2180 w
9 /LucidaSans-Italic f
(l) 1797 2180 w
9 /S f
(-) 1845 2180 w
9 /LucidaSansUnicode00 f
(1) 1910 2180 w
(\)) 1974 2180 w
9 /LucidaSans-Italic f
(n) 2019 2180 w
9 /LucidaSansUnicode00 f
(,) 2082 2180 w
(1) 2118 2180 w
(,) 2182 2180 w
(1) 2218 2180 w
9 /S f
(+) 2290 2180 w
9 /LucidaSans-Italic f
(n) 2355 2180 w
9 /LucidaSansUnicode00 f
(,) 2418 2180 w
(1) 2454 2180 w
9 /S f
(+) 2526 2180 w
9 /LucidaSansUnicode00 f
(2) 2591 2180 w
9 /LucidaSans-Italic f
(n) 2655 2180 w
9 /LucidaSansUnicode00 f
(,) 2718 2180 w
9 /LucidaTypewriter f
(.) 2819 2158 w
(.) 2949 2158 w
(.) 3079 2158 w
11 /LucidaSansUnicode00 f
(Suppose) 720 2370 w
(that) 1213 2370 w
(two) 1467 2370 w
(blocks) 1703 2370 w
11 /LucidaSans-Italic f
(w) 2090 2370 w
11 /LucidaSansUnicode00 f
(and) 2219 2370 w
11 /LucidaSans-Italic f
(w) 2460 2370 w
11 /S f
(+) 2573 2370 w
11 /LucidaSansUnicode00 f
(1) 2652 2370 w
(are) 2764 2370 w
(written) 2975 2370 w
(to) 3393 2370 w
(the) 3545 2370 w
(Fileserver) 3760 2370 w
(with) 4316 2370 w
(an) 4586 2370 w
(empty) 4759 2370 w
(cache.) 5134 2370 w
(Suppose) 720 2500 w
(further) 1215 2500 w
(that) 1630 2500 w
11 /LucidaSans-Italic f
(w) 1886 2500 w
11 /S f
(+) 1999 2500 w
11 /LucidaSansUnicode00 f
(1) 2078 2500 w
(%) 2200 2500 w
11 /LucidaSans-Italic f
(l) 2327 2500 w
11 /LucidaSansUnicode00 f
11 /S f
(\271) 2412 2500 w
11 /LucidaSansUnicode00 f
(0.) 2526 2500 w
(Then) 2710 2500 w
(blocks) 3022 2500 w
11 /LucidaSans-Italic f
(w) 3411 2500 w
11 /LucidaSansUnicode00 f
(and) 3542 2500 w
11 /LucidaSans-Italic f
(w) 3785 2500 w
11 /S f
(+) 3898 2500 w
11 /LucidaSansUnicode00 f
(1) 3977 2500 w
(map) 4091 2500 w
(to) 4368 2500 w
(disk) 4521 2500 w
(blocks) 4787 2500 w
11 /LucidaSans-Italic f
(c) 5175 2500 w
11 /LucidaSansUnicode00 f
(and) 5274 2500 w
11 /LucidaSans-Italic f
(c) 720 2630 w
11 /S f
(+) 802 2630 w
11 /LucidaSans-Italic f
(CEPERBK) 881 2630 w
11 /LucidaSansUnicode00 f
(.) 1346 2630 w
(With) 1470 2630 w
(a) 1760 2630 w
(block) 1875 2630 w
(size) 2217 2630 w
(of) 2484 2630 w
(8192) 2646 2630 w
(bytes,) 2976 2630 w
(current) 3350 2630 w
(Fileserver) 3789 2630 w
(parameters) 4355 2630 w
(and) 5013 2630 w
(512) 5265 2630 w
(byte) 720 2760 w
(disk) 984 2760 w
(sectors, this works out) 1240 2760 w
(to 1072 sectors between ) 2488 2760 w
11 /LucidaSansUnicode20 f
(\034) 3844 2760 w
11 /LucidaSansUnicode00 f
(sequential) 3885 2760 w
11 /LucidaSansUnicode20 f
(\035) 4436 2760 w
11 /LucidaSansUnicode00 f
(blocks.) 4512 2760 w
(With) 720 2930 w
(disk) 999 2930 w
(drives) 1263 2930 w
(of) 1627 2930 w
(the) 1778 2930 w
(same) 1992 2930 w
(era) 2316 2930 w
(as) 2527 2930 w
(the) 2687 2930 w
(original) 2901 2930 w
(Fileserver,) 3349 2930 w
(disk) 3939 2930 w
(transfer) 4203 2930 w
(rates) 4665 2930 w
(were) 4973 2930 w
(lim\255) 5270 2930 w
(ited) 720 3060 w
(by) 972 3060 w
(hardware) 1146 3060 w
(buffer) 1690 3060 w
(sizes) 2064 3060 w
(and) 2381 3060 w
(interface) 2626 3060 w
(bandwidth[5].) 3141 3060 w
(Assuming) 3961 3060 w
(a) 4534 3060 w
(transfer) 4642 3060 w
(rate) 5108 3060 w
(of) 5364 3060 w
(1MB/s) 720 3190 w
(and) 1100 3190 w
(a) 1336 3190 w
(seek) 1435 3190 w
(time) 1717 3190 w
(of) 1992 3190 w
(15ms,) 2138 3190 w
(it) 2507 3190 w
(would) 2618 3190 w
(take) 2977 3190 w
(8ms) 3243 3190 w
(to) 3508 3190 w
(transfer) 3654 3190 w
(8192) 4111 3190 w
(bytes) 4425 3190 w
(from) 4748 3190 w
(the) 5041 3190 w
(disk) 5251 3190 w
(and) 720 3320 w
(less) 954 3320 w
(than 15ms to seek) 1196 3320 w
(to another track) 2222 3320 w
(or about) 3114 3320 w
(347KB/s.) 3602 3320 w
(On modern SATA) 4164 3320 w
(drives,) 5116 3320 w
(it) 720 3450 w
(would) 842 3450 w
(take) 1212 3450 w
(26\265s) 1489 3450 w
(to) 1801 3450 w
(transfer) 1958 3450 w
(8192) 2426 3450 w
(bytes) 2751 3450 w
(from) 3086 3450 w
(the) 3391 3450 w
(disk) 3612 3450 w
(and) 3883 3450 w
(up) 4131 3450 w
(to) 4318 3450 w
(9ms) 4476 3450 w
(to) 4753 3450 w
(seek.) 4911 3450 w
(this) 5275 3450 w
(would) 720 3580 w
(only) 1079 3580 w
(yield) 1341 3580 w
(890KB/s.) 1631 3580 w
(During) 2196 3580 w
(testing) 2598 3580 w
(about) 3004 3580 w
(2MB/s) 3348 3580 w
(was) 3728 3580 w
(observed.) 3968 3580 w
(If) 4563 3580 w
(this) 4674 3580 w
(same) 4908 3580 w
(ratio) 5226 3580 w
(of) 720 3710 w
(calculated) 886 3710 w
(versus) 1482 3710 w
(actual) 1884 3710 w
(seek) 2261 3710 w
(time) 2563 3710 w
(were) 2858 3710 w
(to) 3170 3710 w
(hold) 3336 3710 w
(for) 3630 3710 w
(older) 3841 3710 w
(drives,) 4174 3710 w
(the) 4588 3710 w
(older) 4817 3710 w
(drives) 5151 3710 w
(would operate) 720 3840 w
(at) 1518 3840 w
(near rated bandwidth.) 1655 3840 w
(When the) 720 4010 w
(formula) 1254 4010 w
(was changed to) 1705 4010 w
9 /LucidaTypewriter f
(n) 1268 4180 w
(=) 1398 4180 w
(w) 1528 4180 w
(%) 1658 4180 w
(rows) 1788 4180 w
(c) 1268 4290 w
(=) 1398 4290 w
(column*CEPERBK) 1528 4290 w
(+) 2503 4290 w
(n,) 2633 4290 w
11 /LucidaSansUnicode00 f
(the) 720 4480 w
(blocks are) 926 4480 w
(linearized onto disk) 1508 4480 w
(in the) 2603 4480 w
(following order) 2944 4480 w
9 /LucidaSansUnicode00 f
(0) 1268 4650 w
(,) 1332 4650 w
(1) 1368 4650 w
(,) 1432 4650 w
9 /LucidaSans-Italic f
(.) 1468 4650 w
9 /LucidaSansUnicode00 f
(..) 1497 4650 w
(,) 1562 4650 w
9 /LucidaSans-Italic f
(l) 1598 4650 w
9 /S f
(-) 1646 4650 w
9 /LucidaSansUnicode00 f
(1) 1711 4650 w
(,) 1775 4650 w
9 /LucidaSans-Italic f
(l) 1811 4650 w
9 /LucidaSansUnicode00 f
(,) 1844 4650 w
9 /LucidaSans-Italic f
(l) 1880 4650 w
9 /S f
(+) 1928 4650 w
9 /LucidaSansUnicode00 f
(1) 1993 4650 w
(,) 2057 4650 w
9 /LucidaTypewriter f
(.) 2158 4628 w
(.) 2288 4628 w
(.) 2418 4628 w
(,) 2548 4650 w
11 /LucidaSansUnicode00 f
(changing) 720 4840 w
(from) 1272 4840 w
(row-) 1590 4840 w
(to) 1914 4840 w
(column-major) 2085 4840 w
(ordering,) 2913 4840 w
(performance) 3468 4840 w
(increased) 4210 4840 w
(to) 4785 4840 w
(~25MB/s.) 4957 4840 w
(Note) 720 4970 w
(that) 1025 4970 w
(not) 1290 4970 w
(caching) 1520 4970 w
(blocks) 1983 4970 w
(in) 2381 4970 w
(state) 2535 4970 w
11 /LucidaTypewriter f
(Cread) 2850 4970 w
11 /LucidaSansUnicode00 f
(insures) 3299 4970 w
(that) 3740 4970 w
11 /LucidaSans-Italic f
(w) 4005 4970 w
11 /LucidaSansUnicode00 f
(and) 4145 4970 w
11 /LucidaSans-Italic f
(w) 4397 4970 w
11 /S f
(+) 4510 4970 w
11 /LucidaSansUnicode00 f
(1) 4589 4970 w
(will) 4712 4970 w
(be) 4947 4970 w
(stored) 5132 4970 w
(sequentially) 720 5100 w
(on) 1462 5100 w
(disk,) 1699 5100 w
(as) 2057 5100 w
11 /LucidaTypewriter f
(column) 2276 5100 w
11 /LucidaSansUnicode00 f
(will) 2852 5100 w
(be) 3135 5100 w
(the) 3368 5100 w
(same) 3641 5100 w
(for) 4024 5100 w
11 /LucidaSans-Italic f
(w) 4279 5100 w
11 /LucidaSansUnicode00 f
(and) 4467 5100 w
11 /LucidaSans-Italic f
(w) 4767 5100 w
11 /S f
(+) 4880 5100 w
11 /LucidaSansUnicode00 f
(1) 4959 5100 w
(unless) 5130 5100 w
11 /LucidaSans-Italic f
(w) 720 5230 w
11 /S f
(+) 833 5230 w
11 /LucidaSansUnicode00 f
(1) 912 5230 w
(%) 1034 5230 w
11 /LucidaSans-Italic f
(rows) 1161 5230 w
11 /LucidaSansUnicode00 f
11 /S f
(=) 1479 5230 w
11 /LucidaSansUnicode00 f
(0.) 1602 5230 w
(However,) 1803 5230 w
(in) 2359 5230 w
(this) 2521 5230 w
(case) 2780 5230 w
(the) 3077 5230 w
(blocks) 3310 5230 w
(will) 3716 5230 w
(also) 3959 5230 w
(be) 4237 5230 w
(stored) 4430 5230 w
(sequentially) 4832 5230 w
(because) 720 5360 w
(row) 1189 5360 w
11 /LucidaSans-Italic f
(r) 1421 5360 w
11 /LucidaSansUnicode00 f
(and row) 1509 5360 w
11 /LucidaSans-Italic f
(r) 1974 5360 w
11 /S f
(+) 2054 5360 w
11 /LucidaSansUnicode00 f
(1 are) 2133 5360 w
(also sequential.) 2440 5360 w
11 /LucidaSans-Demi f
(5.) 720 5620 w
(Assumptions) 888 5620 w
(Redux) 1670 5620 w
11 /LucidaSansUnicode00 f
(If) 1080 5850 w
(a) 1188 5850 w
(cat) 1284 5850 w
(can kill) 1477 5850 w
(a) 1892 5850 w
(rat) 1988 5850 w
(in a) 2170 5850 w
(minute, how) 2401 5850 w
(long would it) 3099 5850 w
(be) 3833 5850 w
(killing 60,000 rats?) 3999 5850 w
(Ah, how) 1080 5980 w
(long, indeed!) 1549 5980 w
(My private) 2321 5980 w
(opinion is that) 2910 5980 w
(the) 3717 5980 w
(rats would kill) 3923 5980 w
(the) 4712 5980 w
(cat.) 4918 5980 w
11 /LucidaSansUnicode20 f
(\023) 1355 6110 w
11 /LucidaSansUnicode00 f
(Lewis Carroll) 1445 6110 w
(The) 720 6300 w
(Fileserver) 954 6300 w
11 /LucidaSansUnicode20 f
(\031) 1466 6300 w
11 /LucidaSansUnicode00 f
(s read-ahead system consists of) 1501 6300 w
(a) 3268 6300 w
(queue) 3365 6300 w
(of) 3730 6300 w
(blocks) 3874 6300 w
(to) 4254 6300 w
(be) 4398 6300 w
(read) 4565 6300 w
(and) 4838 6300 w
(a) 5072 6300 w
(set) 5169 6300 w
(of) 5364 6300 w
(processes) 720 6430 w
(which) 1285 6430 w
(read) 1630 6430 w
(them) 1903 6430 w
(into) 2212 6430 w
(the) 2456 6430 w
(cache.) 2663 6430 w
(Although) 3072 6430 w
(the) 3596 6430 w
(original) 3803 6430 w
(paper on the) 4243 6430 w
(Fileserver) 4960 6430 w
(only) 720 6560 w
(lists) 986 6560 w
(one) 1245 6560 w
11 /LucidaTypewriter f
(rah) 1484 6560 w
11 /LucidaSansUnicode00 f
(process,) 1763 6560 w
(the) 2251 6560 w
(earliest) 2464 6560 w
(Fileserver) 2897 6560 w
(at) 3452 6560 w
(the) 3597 6560 w
(Labs) 3811 6560 w
11 /LucidaSansUnicode20 f
(\031) 4055 6560 w
11 /LucidaSansUnicode00 f
(WORM) 4133 6560 w
(started) 4521 6560 w
(four.) 4939 6560 w
(The) 5273 6560 w
(Fourth) 720 6690 w
(Edition Fileserver again started one) 1104 6690 w
11 /LucidaTypewriter f
(rah) 3021 6690 w
11 /LucidaSansUnicode00 f
(process but) 3293 6690 w
(attempted to sort) 3952 6690 w
(the) 4922 6690 w
(blocks) 5128 6690 w
(by) 720 6820 w
11 /LucidaTypewriter f
(w-) 893 6820 w
11 /LucidaSansUnicode00 f
(address) 1051 6820 w
(before) 1516 6820 w
(processing.) 1909 6820 w
(This) 2605 6820 w
(approach) 2877 6820 w
(probably) 3420 6820 w
(makes) 3937 6820 w
(sense) 4330 6820 w
(on) 4682 6820 w
(slow,) 4865 6820 w
(parti\255) 5188 6820 w
(tioned) 720 6950 w
(disks.) 1100 6950 w
(However,) 1488 6950 w
(it) 2023 6950 w
(has) 2137 6950 w
(the) 2363 6950 w
(disadvantage) 2574 6950 w
(of) 3319 6950 w
(processing) 3467 6950 w
(blocks) 4086 6950 w
(serially.) 4470 6950 w
(The) 4957 6950 w
(more) 5196 6950 w
(parallelism) 720 7080 w
(one) 1358 7080 w
(can) 1609 7080 w
(achieve) 1848 7080 w
(among) 2300 7080 w
(or) 2720 7080 w
(within) 2887 7080 w
(the) 3268 7080 w
(Fileserver) 3494 7080 w
11 /LucidaSansUnicode20 f
(\031) 4006 7080 w
11 /LucidaSansUnicode00 f
(s) 4041 7080 w
(devices,) 4152 7080 w
(the) 4636 7080 w
(greater) 4862 7080 w
(the) 5301 7080 w
(performance) 720 7210 w
(penalty of) 1433 7210 w
(the) 2001 7210 w
(sequential) 2207 7210 w
(approach.) 2793 7210 w
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11 /LucidaSansUnicode00 f
(To) 720 850 w
(test) 912 850 w
(this) 1168 850 w
(idea,) 1421 850 w
(a) 1736 850 w
(1GB) 1853 850 w
(file) 2121 850 w
(was) 2344 850 w
(created) 2602 850 w
(on) 3054 850 w
(the) 3245 850 w
(Fileserver) 3472 850 w
(on) 4040 850 w
(AoE) 4231 850 w
(storage.) 4489 850 w
(The) 5015 850 w
(AoE) 5270 850 w
(driver) 720 980 w
(has) 1082 980 w
(a) 1319 980 w
(maximum) 1432 980 w
(of) 2018 980 w
(24) 2178 980 w
(outstanding) 2368 980 w
(frames) 3059 980 w
(per) 3477 980 w
(target.) 3704 980 w
(After) 4143 980 w
(rebooting) 4459 980 w
(the) 5029 980 w
(File\255) 5251 980 w
(server) 720 1110 w
(to) 1095 1110 w
(flush) 1251 1110 w
(the) 1564 1110 w
(Block) 1783 1110 w
(Cache,) 2114 1110 w
(it) 2520 1110 w
(took) 2641 1110 w
(25.5s) 2928 1110 w
(to) 3274 1110 w
(read) 3430 1110 w
(the) 3715 1110 w
(file.) 3934 1110 w
(Subsequent) 4220 1110 w
(reads) 4891 1110 w
(took) 5233 1110 w
(and) 720 1240 w
(average) 954 1240 w
(of) 1406 1240 w
(13.72s.) 1550 1240 w
(After) 2023 1240 w
(changing) 2324 1240 w
(the) 2849 1240 w
(read-ahead) 3056 1240 w
(algorithm to use) 3714 1240 w
(10 independent) 4629 1240 w
11 /LucidaTypewriter f
(rah) 720 1370 w
11 /LucidaSansUnicode00 f
(processes,) 996 1370 w
(the) 1599 1370 w
(test) 1809 1370 w
(was) 2048 1370 w
(rerun.) 2289 1370 w
(It) 2687 1370 w
(took) 2800 1370 w
(15.74s) 3079 1370 w
(to) 3486 1370 w
(read) 3634 1370 w
(the) 3911 1370 w
(file.) 4122 1370 w
(Increasing) 4399 1370 w
(the) 4987 1370 w
(num\255) 5198 1370 w
(ber) 720 1500 w
(of) 935 1500 w
11 /LucidaTypewriter f
(rah) 1082 1500 w
11 /LucidaSansUnicode00 f
(processes) 1358 1500 w
(to) 1926 1500 w
(20) 2073 1500 w
(reduced) 2250 1500 w
(the) 2720 1500 w
(uncached) 2930 1500 w
(read) 3477 1500 w
(time) 3753 1500 w
(to) 4029 1500 w
(13.75s,) 4176 1500 w
(the) 4617 1500 w
(same) 4827 1500 w
(as) 5146 1500 w
(the) 5301 1500 w
(cached read time.) 720 1630 w
(Two concurrent) 1741 1630 w
(readers can each read the) 2608 1630 w
(entire) 4023 1630 w
(file) 4368 1630 w
(in 15.17s, so) 4570 1630 w
(the) 5301 1630 w
(throughput) 720 1760 w
(appears to be) 1358 1760 w
(limited by) 2125 1760 w
11 /LucidaTypewriter f
(9P/IL) 2691 1760 w
11 /LucidaSansUnicode00 f
(latency.) 3121 1760 w
11 /LucidaSans-Demi f
(6.) 720 2020 w
(Core) 888 2020 w
(Improvements) 1186 2020 w
11 /LucidaSansUnicode00 f
(The) 720 2190 w
11 /LucidaTypewriter f
(port) 967 2190 w
11 /LucidaSansUnicode00 f
(directory) 1332 2190 w
(underwent) 1855 2190 w
(some) 2472 2190 w
(housecleaning.) 2808 2190 w
(The) 3695 2190 w
11 /LucidaTypewriter f
(9p1) 3943 2190 w
11 /LucidaSansUnicode00 f
(protocol) 4229 2190 w
(was) 4722 2190 w
(removed.) 4973 2190 w
(The) 720 2320 w
(console) 958 2320 w
(code) 1405 2320 w
(was) 1698 2320 w
(rewritten) 1939 2320 w
(to) 2458 2320 w
(use) 2604 2320 w
(the) 2828 2320 w
11 /LucidaTypewriter f
(9p2) 3037 2320 w
11 /LucidaSansUnicode00 f
(code.) 3312 2320 w
(The) 3674 2320 w
(time) 3911 2320 w
(zone) 4186 2320 w
(code) 4484 2320 w
(was) 4776 2320 w
(replaced) 5016 2320 w
(with) 720 2450 w
(the) 988 2450 w
(offset) 1201 2450 w
(pairs) 1551 2450 w
(from) 1856 2450 w
(the) 2153 2450 w
(CPU) 2366 2450 w
(kernel) 2621 2450 w
(to) 2997 2450 w
(allow) 3148 2450 w
(for) 3468 2450 w
(arbitrary) 3664 2450 w
(time) 4163 2450 w
(zones.) 4443 2450 w
(A) 4872 2450 w
(CEC) 4991 2450 w
(con\255) 5245 2450 w
(sole) 720 2580 w
(was added to allow) 972 2580 w
(access without) 2029 2580 w
(a) 2848 2580 w
(serial) 2944 2580 w
(console.) 3267 2580 w
(More) 720 2750 w
(significantly,) 1026 2750 w
11 /LucidaTypewriter f
(Lock) 1742 2750 w
11 /LucidaSansUnicode00 f
(s) 2058 2750 w
(were) 2151 2750 w
(changed) 2443 2750 w
(from) 2933 2750 w
(queueing) 3226 2750 w
(locks) 3761 2750 w
(to) 4074 2750 w
(spin) 4220 2750 w
(locks.) 4483 2750 w
(Since) 4866 2750 w
(a) 5181 2750 w
(sig\255) 5280 2750 w
(nificant) 720 2880 w
(use) 1162 2880 w
(of) 1391 2880 w
(spin) 1541 2880 w
(locks) 1808 2880 w
(is) 2125 2880 w
(to) 2255 2880 w
(lock) 2405 2880 w
(queues) 2666 2880 w
(to) 3093 2880 w
(add) 3243 2880 w
(work) 3484 2880 w
(and) 3787 2880 w
(wake) 4027 2880 w
(consumers,) 4341 2880 w
11 /LucidaTypewriter f
(unlock) 4998 2880 w
11 /LucidaSansUnicode00 f
(reschedules) 720 3010 w
(if) 1401 3010 w
(the) 1519 3010 w
(current) 1735 3010 w
(process) 2165 3010 w
(no) 2621 3010 w
(longer) 2801 3010 w
(holds) 3188 3010 w
(any) 3525 3010 w
(locks) 3756 3010 w
(and) 4076 3010 w
(has) 4320 3010 w
(woken) 4551 3010 w
(processes) 4943 3010 w
(while) 720 3140 w
(it) 1043 3140 w
(held) 1160 3140 w
(locks.) 1435 3140 w
(Also,) 1824 3140 w
(the) 2134 3140 w
(scheduler) 2349 3140 w
(takes) 2911 3140 w
(care) 3239 3140 w
(not) 3507 3140 w
(to) 3726 3140 w
(preempt) 3877 3140 w
(a) 4370 3140 w
(process) 4474 3140 w
(with) 4928 3140 w
(locks) 5197 3140 w
(held.) 720 3270 w
(This improved) 1056 3270 w
(the) 1855 3270 w
(throughput) 2062 3270 w
(of) 2701 3270 w
(single-threaded) 2845 3270 w
(reads) 3740 3270 w
(by) 4069 3270 w
(25%.) 4231 3270 w
(These) 4549 3270 w
(ideas) 4902 3270 w
(were) 5218 3270 w
(taken from the) 720 3400 w
(CPU) 1547 3400 w
(kernel.) 1795 3400 w
(Networking) 720 3570 w
(was) 1389 3570 w
(changed) 1647 3570 w
(to) 2156 3570 w
(allow) 2321 3570 w
(interfaces) 2655 3570 w
(with) 3236 3570 w
(jumbo) 3519 3570 w
(MTUs.) 3915 3570 w
(This) 4338 3570 w
(is) 4620 3570 w
(not) 4765 3570 w
(currently) 4998 3570 w
(used by the) 720 3700 w
(IL code) 1377 3700 w
(as it) 1791 3700 w
(has no MTU) 2051 3700 w
(discovery mechanism.) 2716 3700 w
11 /LucidaSans-Demi f
(7.) 720 3960 w
(PC Architecture) 888 3960 w
(Improvements) 1802 3960 w
11 /LucidaSansUnicode00 f
(By) 720 4130 w
(far) 885 4130 w
(the) 1077 4130 w
(largest) 1293 4130 w
(change) 1703 4130 w
(in) 2131 4130 w
(the) 2276 4130 w
(PC) 2492 4130 w
(architecture) 2674 4130 w
(was) 3356 4130 w
(to) 3603 4130 w
(memory) 3756 4130 w
(handling.) 4236 4130 w
(The) 4817 4130 w
(primary) 5061 4130 w
(goal) 720 4260 w
(was) 992 4260 w
(to) 1238 4260 w
(be) 1389 4260 w
(able) 1563 4260 w
(to) 1830 4260 w
(handle) 1981 4260 w
(most) 2384 4260 w
(of) 2693 4260 w
(the) 2844 4260 w
(bottom) 3058 4260 w
(4GB) 3488 4260 w
(of) 3743 4260 w
(memory.) 3894 4260 w
(Thus) 4442 4260 w
(the) 4746 4260 w
(definition) 4960 4260 w
(of) 720 4390 w
11 /LucidaTypewriter f
(KZERO) 881 4390 w
11 /LucidaSansUnicode00 f
(needed) 1329 4390 w
(to) 1774 4390 w
(be) 1935 4390 w
(changed.) 2119 4390 w
(The) 2694 4390 w
(PC) 2946 4390 w
(port) 3136 4390 w
(inherited) 3411 4390 w
(its) 3943 4390 w
(memory) 4125 4390 w
(layout) 4613 4390 w
(from) 4992 4390 w
(the) 5301 4390 w
(MIPS) 720 4520 w
(port.) 1011 4520 w
(On) 1347 4520 w
(the) 1545 4520 w
(MIPS) 1760 4520 w
(processor,) 2051 4520 w
(the) 2653 4520 w
(high) 2868 4520 w
(bit) 3148 4520 w
(indicated) 3334 4520 w
(kernel) 3867 4520 w
(mode.) 4243 4520 w
(Thus) 4656 4520 w
(Fileserver) 4960 4520 w
(memory) 720 4650 w
(was) 1194 4650 w
(mapped) 1435 4650 w
(from) 1906 4650 w
11 /LucidaTypewriter f
(0x80000000) 2200 4650 w
11 /LucidaSansUnicode00 f
(to) 3029 4650 w
(the) 3177 4650 w
(top) 3388 4650 w
(of) 3605 4650 w
(memory.) 3753 4650 w
(Converting) 4298 4650 w
(between) 4922 4650 w
(a) 5411 4650 w
(physical) 720 4780 w
(and) 1214 4780 w
(virtual) 1475 4780 w
(address) 1874 4780 w
(was) 2354 4780 w
(done) 2618 4780 w
(by) 2946 4780 w
(inverting) 3134 4780 w
(the) 3669 4780 w
(high) 3902 4780 w
(bit.) 4200 4780 w
(While) 4474 4780 w
(simple,) 4825 4780 w
(this) 5275 4780 w
(scheme) 720 4910 w
(allows) 1185 4910 w
(for) 1577 4910 w
(a) 1789 4910 w
(maximum) 1909 4910 w
(of) 2502 4910 w
(only) 2669 4910 w
(2GB.) 2952 4910 w
(Lowering) 3258 4910 w
11 /LucidaTypewriter f
(KZERO) 3802 4910 w
11 /LucidaSansUnicode00 f
(to) 4256 4910 w
11 /LucidaTypewriter f
(0x30000000) 4424 4910 w
11 /LucidaSansUnicode00 f
(and) 5274 4910 w
(mapping PCI) 720 5040 w
(space) 1428 5040 w
(to) 1767 5040 w
11 /LucidaTypewriter f
(0x20000000) 1910 5040 w
11 /LucidaSansUnicode00 f
(allows for) 2735 5040 w
11 /LucidaTypewriter f
(3328MB) 3291 5040 w
11 /LucidaSansUnicode00 f
(memory.) 3800 5040 w
(Unfortunately,) 720 5210 w
(being) 1527 5210 w
(able) 1871 5210 w
(to) 2140 5210 w
(recognize) 2293 5210 w
(more) 2861 5210 w
(memory) 3182 5210 w
(puts) 3662 5210 w
(us) 3941 5210 w
(in) 4110 5210 w
(greater) 4255 5210 w
(danger) 4684 5210 w
(of) 5102 5210 w
(run\255) 5255 5210 w
(ning) 720 5340 w
(into) 1030 5340 w
(PCI) 1312 5340 w
(space) 1555 5340 w
(while) 1933 5340 w
(sizing) 2286 5340 w
(memory,) 2679 5340 w
(so) 3223 5340 w
(another) 3419 5340 w
(method) 3904 5340 w
(is) 4386 5340 w
(needed.) 4547 5340 w
(A) 5082 5340 w
(BIOS) 5231 5340 w
11 /LucidaTypewriter f
(0xe820) 720 5470 w
11 /LucidaSansUnicode00 f
(scan) 1239 5470 w
(was) 1525 5470 w
(chosen.) 1772 5470 w
(Unfortunately,) 2264 5470 w
(the) 3071 5470 w
(processor) 3287 5470 w
(must) 3855 5470 w
(be) 4167 5470 w
(in) 4344 5470 w
(Real) 4490 5470 w
(mode) 4760 5470 w
(to) 5106 5470 w
(per\255) 5260 5470 w
(form) 720 5600 w
(the) 1012 5600 w
(scan) 1220 5600 w
(and) 1498 5600 w
(the) 1733 5600 w
(processor) 1941 5600 w
(is) 2501 5600 w
(already) 2626 5600 w
(in) 3050 5600 w
(Protected) 3187 5600 w
(mode) 3728 5600 w
(when) 4065 5600 w
(the) 4384 5600 w
(Fileserver) 4591 5600 w
(kernel) 5139 5600 w
(is) 720 5730 w
(started.) 847 5730 w
(So,) 1331 5730 w
(Instead) 1531 5730 w
(of) 1959 5730 w
(switching) 2106 5730 w
(back) 2651 5730 w
(to) 2940 5730 w
(real) 3087 5730 w
(mode,) 3327 5730 w
11 /LucidaTypewriter f
(9load) 3702 5730 w
11 /LucidaSansUnicode00 f
(was) 4137 5730 w
(modified) 4379 5730 w
(to) 4893 5730 w
(perform) 5041 5730 w
(the) 720 5860 w
(scan before) 926 5860 w
(turning on paging[8].) 1583 5860 w
(Surprisingly,) 720 6030 w
(the) 1423 6030 w
(preceding) 1631 6030 w
(changes) 2199 6030 w
(were) 2675 6030 w
(not) 2966 6030 w
(enough) 3180 6030 w
(to) 3619 6030 w
(enable) 3765 6030 w
(more) 4157 6030 w
(memory.) 4471 6030 w
(The) 5014 6030 w
(File\255) 5251 6030 w
(server) 720 6160 w
(faulted) 1089 6160 w
(when) 1505 6160 w
(building) 1830 6160 w
(page) 2310 6160 w
(tables.) 2612 6160 w
(It) 3045 6160 w
(turned) 3160 6160 w
(out) 3555 6160 w
(this) 3772 6160 w
(is) 4010 6160 w
(because) 4139 6160 w
(the) 4614 6160 w
(4MB) 4826 6160 w
(tempo\255) 5095 6160 w
(rary) 720 6290 w
(pagetables) 965 6290 w
(built) 1583 6290 w
(by) 1862 6290 w
11 /LucidaTypewriter f
(9load) 2025 6290 w
11 /LucidaSansUnicode00 f
(were) 2457 6290 w
(not) 2748 6290 w
(enough.) 2961 6290 w
(The) 3469 6290 w
(BIOS) 3705 6290 w
(scan) 3983 6290 w
(of) 4262 6290 w
(the) 4408 6290 w
(testing) 4617 6290 w
(machine) 5023 6290 w
(yielded) 720 6420 w
(3326MB) 1169 6420 w
(of) 1670 6420 w
(accessible) 1844 6420 w
(memory.) 2452 6420 w
(This) 3023 6420 w
(would) 3314 6420 w
(require) 3701 6420 w
(3.25MB) 4150 6420 w
(of) 4617 6420 w
(page) 4791 6420 w
(tables.) 5116 6420 w
(Since) 720 6550 w
(the) 1037 6550 w
(bottom) 1248 6550 w
(megabyte) 1675 6550 w
(of) 2237 6550 w
(memory) 2385 6550 w
(is) 2860 6550 w
(unusable,) 2988 6550 w
(we) 3547 6550 w
(don) 3734 6550 w
11 /LucidaSansUnicode20 f
(\031) 3938 6550 w
11 /LucidaSansUnicode00 f
(t) 3973 6550 w
(have) 4054 6550 w
(any) 4342 6550 w
(room) 4568 6550 w
(left) 4890 6550 w
(for) 5107 6550 w
(the) 5301 6550 w
(kernel.) 720 6680 w
(The) 1169 6680 w
(solution) 1414 6680 w
(was) 1891 6680 w
(to) 2139 6680 w
(use) 2293 6680 w
(4MB) 2524 6680 w
(pages.) 2797 6680 w
(This) 3228 6680 w
(eliminates) 3498 6680 w
(the) 4091 6680 w
(need) 4307 6680 w
(for) 4613 6680 w
(page) 4811 6680 w
(tables,) 5116 6680 w
(as the) 720 6810 w
(1024-entry page) 1078 6810 w
(directory has enough space) 2021 6810 w
(to map 4GB) 3525 6810 w
(of) 4182 6810 w
(memory.) 4325 6810 w
(On) 720 6980 w
(64-bit) 911 6980 w
(processors,) 1292 6980 w
(it) 1943 6980 w
(would) 2053 6980 w
(be) 2411 6980 w
(relatively) 2579 6980 w
(easy) 3097 6980 w
(to) 3370 6980 w
(fill) 3515 6980 w
(in) 3689 6980 w
(more) 3826 6980 w
(memory) 4140 6980 w
(from) 4613 6980 w
(above) 4906 6980 w
(4GB) 5260 6980 w
(by using the) 720 7110 w
(40-bit) 1414 7110 w
(extensions to 4MB) 1793 7110 w
(pages.) 2813 7110 w
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11 /LucidaSans-Demi f
(8.) 720 850 w
(The) 888 850 w
(AoE Driver) 1137 850 w
11 /LucidaSansUnicode00 f
(If) 1080 1040 w
(you were) 1188 1040 w
(plowing a) 1704 1040 w
(field what) 2256 1040 w
(would you rather use, 2 strong oxen or) 2817 1040 w
(1024 chickens?) 1080 1170 w
11 /LucidaSansUnicode20 f
(\023) 1355 1300 w
11 /LucidaSansUnicode00 f
(Seymour Cray) 1445 1300 w
(This) 720 1530 w
(is) 986 1530 w
(the) 1115 1530 w
(Fileserver) 1327 1530 w
11 /LucidaSansUnicode20 f
(\031) 1839 1530 w
11 /LucidaSansUnicode00 f
(s) 1874 1530 w
(raison) 1971 1530 w
(d) 2341 1530 w
11 /LucidaSansUnicode20 f
(\031) 2410 1530 w
11 /LucidaSansUnicode00 f
(\352tre.) 2445 1530 w
(The) 2766 1530 w
(AoE) 3006 1530 w
(driver) 3249 1530 w
(is) 3600 1530 w
(based) 3729 1530 w
(on) 4087 1530 w
(the) 4263 1530 w
(Plan) 4475 1530 w
(9) 4738 1530 w
(driver.) 4848 1530 w
(It) 5269 1530 w
(is) 5384 1530 w
(capable) 720 1660 w
(of) 1194 1660 w
(sending) 1366 1660 w
(jumbo) 1853 1660 w
(or) 2256 1660 w
(standard) 2431 1660 w
(AoE) 2964 1660 w
(frames.) 3229 1660 w
(It) 3729 1660 w
(allows) 3865 1660 w
(up) 4261 1660 w
(to) 4461 1660 w
(24) 4632 1660 w
(outstanding) 4833 1660 w
(frames) 720 1790 w
(per) 1129 1790 w
(target.) 1348 1790 w
(It) 1779 1790 w
(also) 1895 1790 w
(allows) 2154 1790 w
(a) 2530 1790 w
(many-to-many) 2634 1790 w
(relationship) 3489 1790 w
(between) 4165 1790 w
(local) 4657 1790 w
(interfaces) 4948 1790 w
(and target) 720 1920 w
(interfaces.) 1306 1920 w
(When) 720 2090 w
(the) 1058 2090 w
(AoE) 1275 2090 w
(driver) 1523 2090 w
(gets) 1879 2090 w
(an) 2152 2090 w
(I/O) 2327 2090 w
(request,) 2549 2090 w
(a) 3033 2090 w
11 /LucidaTypewriter f
(Srb) 3140 2090 w
11 /LucidaSansUnicode00 f
(structure) 3423 2090 w
(is) 3951 2090 w
(allocated) 4085 2090 w
(with) 4612 2090 w
11 /LucidaTypewriter f
(mballoc) 4884 2090 w
11 /LucidaSansUnicode00 f
(.) 5437 2090 w
(Then) 720 2220 w
(the) 1041 2220 w
(request) 1266 2220 w
(is) 1722 2220 w
(chopped) 1863 2220 w
(up) 2376 2220 w
(into) 2566 2220 w
11 /LucidaTypewriter f
(Frame) 2827 2220 w
11 /LucidaSansUnicode00 f
(structures) 3275 2220 w
(as) 3866 2220 w
(available) 4036 2220 w
(Each) 4591 2220 w
(is) 4888 2220 w
(sized) 5029 2220 w
(to) 5364 2220 w
(MTU) 720 2350 w
(of) 1008 2350 w
(the) 1165 2350 w
(chosen) 1385 2350 w
(link.) 1811 2350 w
(A) 2126 2350 w
(link) 2251 2350 w
(is) 2496 2350 w
(chosen) 2633 2350 w
(round-robin) 3059 2350 w
(fashion) 3770 2350 w
(first) 4212 2350 w
(among) 4476 2350 w
(local) 4891 2350 w
(inter\255) 5188 2350 w
(faces) 720 2480 w
(which) 1037 2480 w
(can) 1386 2480 w
(see) 1611 2480 w
(the) 1831 2480 w
(target) 2042 2480 w
(and) 2400 2480 w
(then) 2638 2480 w
(among) 2917 2480 w
(the) 3323 2480 w
(target) 3534 2480 w
11 /LucidaSansUnicode20 f
(\031) 3852 2480 w
11 /LucidaSansUnicode00 f
(s) 3887 2480 w
(MAC) 3983 2480 w
(addresses.) 4270 2480 w
(MTUs) 4916 2480 w
(may) 5252 2480 w
(be) 720 2610 w
(freely) 895 2610 w
(mixed.) 1238 2610 w
(The) 1684 2610 w
(frames) 1928 2610 w
(are) 2340 2610 w
(sent) 2553 2610 w
(and) 2825 2610 w
(the) 3068 2610 w
(number) 3284 2610 w
(of) 3743 2610 w
(outstanding) 3896 2610 w
(frames) 4580 2610 w
(is) 4992 2610 w
(appro\255) 5125 2610 w
(priately) 720 2740 w
(incremented.) 1159 2740 w
(The) 1936 2740 w
(driver) 2175 2740 w
(then) 2525 2740 w
(sleeps) 2804 2740 w
(on) 3181 2740 w
(the) 3355 2740 w
11 /LucidaTypewriter f
(Srb) 3565 2740 w
11 /LucidaSansUnicode00 f
(.) 3802 2740 w
(When) 3911 2740 w
(awoken,) 4243 2740 w
(the) 4724 2740 w
(process) 4934 2740 w
(is) 5384 2740 w
(repeated until) 720 2870 w
(all) 1502 2870 w
(the) 1662 2870 w
(bytes in the) 1868 2870 w
(request) 2529 2870 w
(have) 2967 2870 w
(been received.) 3250 2870 w
(When) 720 3040 w
(an) 1065 3040 w
(AoE) 1246 3040 w
(frame) 1500 3040 w
(is) 1863 3040 w
(received) 2003 3040 w
(that) 2501 3040 w
(corresponds) 2765 3040 w
(to) 3478 3040 w
(I/O,) 3639 3040 w
(the) 3903 3040 w
(frame) 4127 3040 w
(is) 4491 3040 w
(copied) 4632 3040 w
(into) 5040 3040 w
(the) 5301 3040 w
(buffer) 720 3170 w
(of) 1092 3170 w
(the) 1246 3170 w
11 /LucidaTypewriter f
(Srb) 1463 3170 w
11 /LucidaSansUnicode00 f
(and) 1746 3170 w
(the) 1990 3170 w
(number) 2207 3170 w
(of) 2667 3170 w
(outstanding) 2821 3170 w
(frames) 3505 3170 w
(is) 3917 3170 w
(decremented.) 4050 3170 w
(If) 4863 3170 w
(there) 4981 3170 w
(are) 5304 3170 w
(no outstanding frame) 720 3300 w
(remaining, the) 1910 3300 w
11 /LucidaTypewriter f
(Srb) 2724 3300 w
11 /LucidaSansUnicode00 f
(is woken.) 2996 3300 w
(Since) 720 3470 w
(the) 1041 3470 w
(Myricom) 1256 3470 w
(10Gbe) 1754 3470 w
(cards) 2146 3470 w
(have) 2477 3470 w
(an) 2769 3470 w
(MTU) 2942 3470 w
(of) 3226 3470 w
(9000) 3378 3470 w
(bytes,) 3698 3470 w
(an) 4062 3470 w
(entire) 4235 3470 w
(8192) 4589 3470 w
(byte) 4910 3470 w
(block) 5184 3470 w
(and) 720 3600 w
(the) 961 3600 w
(AoE) 1175 3600 w
(header) 1420 3600 w
(fit) 1830 3600 w
(into) 1986 3600 w
(a) 2236 3600 w
(single) 2339 3600 w
(frame.) 2699 3600 w
(Thus) 3122 3600 w
(sequential) 3425 3600 w
(read) 4018 3600 w
(performance) 4297 3600 w
(depends) 5017 3600 w
(on frame) 720 3730 w
(latency.) 1236 3730 w
(Performance) 1718 3730 w
(was measured with a) 2423 3730 w
(process running the) 3577 3730 w
(following code) 4681 3730 w
9 /LucidaTypewriter f
(static) 1008 3900 w
(void) 1463 3900 w
(devcopy\(Dcopy) 1008 4010 w
(*d\)) 1918 4010 w
({) 1008 4120 w
(Iobuf) 1268 4230 w
(*b;) 1658 4230 w
(for\(d->p) 1268 4450 w
(=) 1853 4450 w
(d->start;) 1983 4450 w
(d->p) 2633 4450 w
(<) 2958 4450 w
(d->lim;) 3088 4450 w
(d->p++\){) 3608 4450 w
(b) 1528 4560 w
(=) 1658 4560 w
(getbuf\(d->from,) 1788 4560 w
(d->p,) 2828 4560 w
(Bread\);) 3218 4560 w
(if\(b) 1528 4670 w
(==) 1853 4670 w
(0\)) 2048 4670 w
(continue;) 1788 4780 w
(putbuf\(b\);) 1528 4890 w
(}) 1268 5000 w
(}) 1008 5110 w
11 /LucidaSansUnicode00 f
(The) 720 5300 w
(latency) 970 5300 w
(for) 1398 5300 w
(an) 1602 5300 w
(frame) 1782 5300 w
(with) 2144 5300 w
(8192) 2421 5300 w
(data) 2749 5300 w
(bytes) 3033 5300 w
(is) 3370 5300 w
(79\265s) 3510 5300 w
(giving) 3825 5300 w
(12,500pps) 4202 5300 w
(or) 4828 5300 w
(103MB/s) 4992 5300 w
(while) 720 5430 w
(two) 1053 5430 w
(concurrent) 1300 5430 w
(reads) 1930 5430 w
(yield) 2277 5430 w
(201MB/s.) 2583 5430 w
(Testing) 3187 5430 w
(beyond) 3637 5430 w
(this) 4083 5430 w
(level) 4334 5430 w
(of) 4633 5430 w
(performance) 4794 5430 w
(has not) 720 5560 w
(been performed.) 1151 5560 w
11 /LucidaSans-Demi f
(9.) 720 5820 w
(System) 888 5820 w
(Performance) 1330 5820 w
11 /LucidaSansUnicode00 f
(I) 720 5990 w
(measured) 794 5990 w
(both) 1361 5990 w
(latency) 1648 5990 w
(and) 2067 5990 w
(throughput) 2307 5990 w
(of) 2952 5990 w
(reading) 3102 5990 w
(and) 3549 5990 w
(writing) 3789 5990 w
(bytes) 4202 5990 w
(between) 4529 5990 w
(two) 5020 5990 w
(pro\255) 5255 5990 w
(cesses) 720 6120 w
(for) 1136 6120 w
(a) 1357 6120 w
(number) 1486 6120 w
(of) 1968 6120 w
(different) 2144 6120 w
(paths.) 2673 6120 w
(2007) 3106 6120 w
(measurements) 3450 6120 w
(were) 4302 6120 w
(made) 4623 6120 w
(using) 4984 6120 w
(an) 5343 6120 w
11 /LucidaSans-Italic f
(SR1521) 720 6250 w
11 /LucidaSansUnicode00 f
(AoE) 1162 6250 w
(target,) 1400 6250 w
(an) 1789 6250 w
(Intel) 1954 6250 w
(Xeon-5000-based) 2225 6250 w
(cpu) 3248 6250 w
(server) 3477 6250 w
(with) 3840 6250 w
(a) 4102 6250 w
(1.6Ghz) 4199 6250 w
(processor) 4618 6250 w
(and) 5177 6250 w
(a) 5411 6250 w
(Xeon-5000-based) 720 6380 w
(Fileserver) 1764 6380 w
(with) 2333 6380 w
(a) 2615 6380 w
(3.0Ghz) 2732 6380 w
(processor.) 3171 6380 w
(1993) 3820 6380 w
(measurements) 4152 6380 w
(are) 4993 6380 w
(from) 5217 6380 w
([6].) 720 6510 w
(The) 971 6510 w
(latency) 1210 6510 w
(is) 1627 6510 w
(measured) 1755 6510 w
(as) 2320 6510 w
(the) 2477 6510 w
(round) 2688 6510 w
(trip) 3045 6510 w
(time) 3272 6510 w
(for) 3549 6510 w
(a) 3742 6510 w
(byte) 3843 6510 w
(sent) 4112 6510 w
(from) 4379 6510 w
(one) 4674 6510 w
(process) 4912 6510 w
(to) 5364 6510 w
(another) 720 6640 w
(and) 1171 6640 w
(back) 1408 6640 w
(again.) 1697 6640 w
(Throughput) 2096 6640 w
(is) 2766 6640 w
(measured) 2893 6640 w
(using) 3457 6640 w
(16k) 3788 6640 w
(writes) 4028 6640 w
(from) 4387 6640 w
(one) 4680 6640 w
(process) 4915 6640 w
(to) 5364 6640 w
(another.) 720 6770 w
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11 /S f
(_) 985 865 w
(____________________________________________________________________________) 1027 865 w
11 /LucidaSansUnicode00 f
(Table) 2527 995 w
(1 ) 2855 995 w
11 /LucidaSansUnicode20 f
(\023) 2959 995 w
11 /LucidaSansUnicode00 f
(Performance) 3049 995 w
11 /S f
(_) 985 1015 w
(____________________________________________________________________________) 1027 1015 w
11 /LucidaSansUnicode00 f
(test) 1367 1145 w
(93 throughput) 2032 1145 w
(93 latency) 2973 1145 w
(07 throughput) 3688 1145 w
(07 latency) 4629 1145 w
(MB/s) 2283 1275 w
(\265s) 3185 1275 w
(MB/s) 3939 1275 w
(\265s) 4841 1275 w
11 /S f
(_) 985 1295 w
(____________________________________________________________________________) 1027 1295 w
11 /LucidaSansUnicode00 f
(pipes) 1122 1425 w
(8.15) 2299 1425 w
(255) 3179 1425 w
(2500) 3947 1425 w
(19) 4873 1425 w
11 /S f
(_) 985 1445 w
(____________________________________________________________________________) 1027 1445 w
11 /LucidaSansUnicode00 f
(IL/ether) 1122 1575 w
(1.02) 2299 1575 w
(1420) 3110 1575 w
(78) 4085 1575 w
(72) 4873 1575 w
11 /S f
(_) 985 1595 w
(____________________________________________________________________________) 1027 1595 w
11 /LucidaSansUnicode00 f
(URP/Datakit) 1122 1725 w
(0.22) 2299 1725 w
(1750) 3110 1725 w
(N/A) 4008 1725 w
(N/A) 4796 1725 w
11 /S f
(_) 985 1745 w
(____________________________________________________________________________) 1027 1745 w
11 /LucidaSansUnicode00 f
(Cyclone; AoE) 1122 1875 w
(3.2) 2299 1875 w
(375) 3179 1875 w
11 /LucidaSansUnicode22 f
(e) 3928 1875 w
11 /LucidaSansUnicode00 f
(250) 4016 1875 w
(49) 4873 1875 w
11 /S f
(_) 985 1895 w
(____________________________________________________________________________) 1027 1895 w
(\347) 985 1895 w
(\347) 985 1855 w
(\347) 985 1745 w
(\347) 985 1635 w
(\347) 985 1525 w
(\347) 985 1415 w
(\347) 985 1305 w
(\347) 985 1195 w
(\347) 985 1085 w
(\347) 985 975 w
(\347) 1922 1895 w
(\347) 1922 1785 w
(\347) 1922 1675 w
(\347) 1922 1565 w
(\347) 1922 1455 w
(\347) 1922 1345 w
(\347) 1922 1235 w
(\347) 1922 1125 w
(\347) 2863 1895 w
(\347) 2863 1785 w
(\347) 2863 1675 w
(\347) 2863 1565 w
(\347) 2863 1455 w
(\347) 2863 1345 w
(\347) 2863 1235 w
(\347) 2863 1125 w
(\347) 3578 1895 w
(\347) 3578 1785 w
(\347) 3578 1675 w
(\347) 3578 1565 w
(\347) 3578 1455 w
(\347) 3578 1345 w
(\347) 3578 1235 w
(\347) 3578 1125 w
(\347) 4519 1895 w
(\347) 4519 1785 w
(\347) 4519 1675 w
(\347) 4519 1565 w
(\347) 4519 1455 w
(\347) 4519 1345 w
(\347) 4519 1235 w
(\347) 4519 1125 w
(\347) 5207 1895 w
(\347) 5207 1855 w
(\347) 5207 1745 w
(\347) 5207 1635 w
(\347) 5207 1525 w
(\347) 5207 1415 w
(\347) 5207 1305 w
(\347) 5207 1195 w
(\347) 5207 1085 w
(\347) 5207 975 w
11 /LucidaSansUnicode00 f
(Random) 720 2190 w
(I/O) 1195 2190 w
(was) 1410 2190 w
(not) 1651 2190 w
(tested) 1867 2190 w
(for) 2238 2190 w
(two) 2431 2190 w
(reasons.) 2664 2190 w
(First,) 3189 2190 w
(~3GB) 3497 2190 w
(of) 3818 2190 w
(recient) 3966 2190 w
(reads) 4372 2190 w
(and) 4705 2190 w
(writes) 4943 2190 w
(are) 5304 2190 w
(stored) 720 2320 w
(in) 1113 2320 w
(the) 1266 2320 w
(Block) 1490 2320 w
(Cache) 1826 2320 w
(and) 2202 2320 w
(when) 2453 2320 w
(new) 2789 2320 w
(or) 3057 2320 w
(newly) 3221 2320 w
(modified) 3577 2320 w
(files) 4103 2320 w
(are) 4378 2320 w
(reread) 4598 2320 w
(from) 4994 2320 w
(the) 5301 2320 w
(cache,) 720 2450 w
(they) 1097 2450 w
(are) 1364 2450 w
(reread) 1571 2450 w
(sequentially.) 1954 2450 w
(It) 2703 2450 w
(is) 2815 2450 w
(expected) 2943 2450 w
(that) 3471 2450 w
(the) 3722 2450 w
(working) 3933 2450 w
(set) 4402 2450 w
(of) 4601 2450 w
(the) 4749 2450 w
(Fileserver) 4960 2450 w
(fit) 720 2580 w
(in) 880 2580 w
(the) 1025 2580 w
(Block) 1241 2580 w
(Cache.) 1569 2580 w
(Second,) 2007 2580 w
(since) 2468 2580 w
(a) 2787 2580 w
(single) 2893 2580 w
(IL) 3256 2580 w
(connection) 3391 2580 w
(is) 4021 2580 w
(latency) 4154 2580 w
(limited,) 4576 2580 w
(reads) 5026 2580 w
(of) 5364 2580 w
(highly) 720 2710 w
(fragmented) 1101 2710 w
(files) 1776 2710 w
(like) 2055 2710 w
11 /LucidaTypewriter f
(/sys/log/auth) 2301 2710 w
11 /LucidaSansUnicode00 f
(from) 3384 2710 w
(the) 3695 2710 w
(WORM) 3922 2710 w
(are) 4323 2710 w
(not) 4548 2710 w
(meaningfully) 4781 2710 w
(slower \(59MB/s\) than reads from the) 720 2840 w
(cache) 2717 2840 w
(\(62MB/s\).) 3055 2840 w
11 /LucidaSans-Demi f
(10.) 720 3100 w
(Discussion) 958 3100 w
11 /LucidaSansUnicode00 f
(Decoupling) 720 3270 w
(storage) 1379 3270 w
(from) 1834 3270 w
(the) 2144 3270 w
(Fileserver) 2370 3270 w
(with) 2937 3270 w
(AoE) 3218 3270 w
(allows) 3475 3270 w
(for) 3863 3270 w
(automatic) 4071 3270 w
(offsite) 4655 3270 w
(backup,) 5050 3270 w
(affords) 720 3400 w
(good) 1149 3400 w
(availability,) 1469 3400 w
(scalablity) 2120 3400 w
(and) 2666 3400 w
(performance.) 2913 3400 w
(The) 3710 3400 w
(Fileserver) 3958 3400 w
(is) 4519 3400 w
(not) 4656 3400 w
(involved) 4880 3400 w
(in) 5372 3400 w
(storage) 720 3530 w
(management.) 1163 3530 w
(It) 1971 3530 w
(is) 2087 3530 w
(possible) 2219 3530 w
(to) 2706 3530 w
(grow) 2858 3530 w
(the) 3167 3530 w
(existing) 3382 3530 w
(WORM) 3852 3530 w
(to) 4241 3530 w
(9TB) 4393 3530 w
(without) 4639 3530 w
(restart\255) 5085 3530 w
(ing) 720 3660 w
(the) 932 3660 w
(fileserver.) 1146 3660 w
(By) 1753 3660 w
(reconfiguring) 1917 3660 w
(the) 2680 3660 w
(Fileserver,) 2894 3660 w
(essentially) 3484 3660 w
(unlimited) 4086 3660 w
(storage) 4635 3660 w
(may) 5078 3660 w
(be) 5341 3660 w
(added.) 720 3790 w
(The) 720 3960 w
(size) 954 3960 w
(of) 1202 3960 w
(the) 1345 3960 w
(WORM) 1551 3960 w
(and Block) 1931 3960 w
(Cache) 2482 3960 w
(have) 2841 3960 w
(scaled) 3125 3960 w
(by) 3497 3960 w
(a) 3659 3960 w
(factor) 3756 3960 w
(of) 4103 3960 w
(1000) 4247 3960 w
(since) 4559 3960 w
([3]) 4869 3960 w
(and) 5046 3960 w
(sin\255) 5280 3960 w
(gle) 720 4090 w
(IL) 921 4090 w
(connections) 1050 4090 w
(have) 1729 4090 w
(scaled) 2015 4090 w
(by) 2389 4090 w
(a) 2553 4090 w
(factor) 2652 4090 w
(of) 3001 4090 w
(200) 3147 4090 w
(since) 3392 4090 w
([7].) 3704 4090 w
(The) 3953 4090 w
(Block) 4190 4090 w
(Cache) 4511 4090 w
(is) 4872 4090 w
(currently) 4998 4090 w
(at) 720 4220 w
(a) 865 4220 w
(practical) 969 4220 w
(maximum) 1465 4220 w
(for) 2042 4220 w
(a) 2238 4220 w
(kernel) 2342 4220 w
(with) 2718 4220 w
(32-bit) 2987 4220 w
(memory) 3374 4220 w
(addresses.) 3853 4220 w
(A) 4503 4220 w
(kernel) 4623 4220 w
(with) 5000 4220 w
(64-) 5270 4220 w
(bit) 720 4350 w
(memory addresses in the) 897 4350 w
(next) 2279 4350 w
(logical) 2552 4350 w
(step.) 2935 4350 w
(The) 720 4520 w
(disk) 975 4520 w
(cache) 1252 4520 w
(has) 1611 4520 w
(not) 1852 4520 w
(been) 2084 4520 w
(scaled) 2401 4520 w
(to) 2794 4520 w
(the) 2959 4520 w
(same) 3187 4520 w
(extent) 3525 4520 w
(as) 3923 4520 w
(the) 4097 4520 w
(increased) 4325 4520 w
(number) 4893 4520 w
(of) 5364 4520 w
(cache) 720 4650 w
(buckets) 1060 4650 w
(put) 1513 4650 w
(more) 1728 4650 w
(pressure) 2041 4650 w
(on) 2541 4650 w
(the) 2713 4650 w
(Block) 2921 4650 w
(Cache) 3241 4650 w
(and) 3601 4650 w
(would) 3836 4650 w
(not) 4194 4650 w
(provide) 4407 4650 w
(much) 4845 4650 w
(bene\255) 5175 4650 w
(fit.) 720 4780 w
(With) 942 4780 w
(the) 1216 4780 w
11 /LucidaTypewriter f
(conf.fastworm) 1426 4780 w
11 /LucidaSansUnicode00 f
(option,) 2492 4780 w
(the) 2910 4780 w
(cache) 3120 4780 w
(only) 3462 4780 w
(need) 3725 4780 w
(to) 4025 4780 w
(be) 4172 4780 w
(large) 4342 4780 w
(enough) 4649 4780 w
(to) 5089 4780 w
(hold) 5236 4780 w
(the) 720 4910 w
(free) 944 4910 w
(list) 1207 4910 w
(and) 1421 4910 w
(any) 1672 4910 w
(blocks) 1911 4910 w
(in) 2308 4910 w
(state) 2461 4910 w
11 /LucidaTypewriter f
(dirty) 2775 4910 w
11 /LucidaSansUnicode00 f
(or) 3223 4910 w
11 /LucidaTypewriter f
(write) 3388 4910 w
11 /LucidaSansUnicode00 f
(.) 3783 4910 w
(Eliminating) 3906 4910 w
(the) 4554 4910 w
(cache) 4778 4910 w
(device) 5134 4910 w
(may) 720 5040 w
(make) 982 5040 w
(sense) 1313 5040 w
(in) 1659 5040 w
(the) 1801 5040 w
(future.) 2014 5040 w
(The) 2451 5040 w
(cache) 2692 5040 w
(device) 3037 5040 w
(could) 3417 5040 w
(be) 3751 5040 w
(replaced) 3924 5040 w
(with) 4422 5040 w
(address) 4690 5040 w
(of) 5150 5040 w
(the) 5301 5040 w
(current) 720 5170 w
(Superblock.) 1152 5170 w
(Addresses) 1860 5170 w
(below) 2458 5170 w
(the) 2820 5170 w
(current) 3038 5170 w
(Superblock) 3469 5170 w
(would) 4106 5170 w
(be) 4473 5170 w
(read) 4650 5170 w
(only.) 4933 5170 w
(The) 5273 5170 w
(disadvantage) 720 5300 w
(to) 1467 5300 w
(such) 1617 5300 w
(a) 1907 5300 w
(scheme) 2010 5300 w
(is) 2458 5300 w
(that) 2588 5300 w
(the) 2841 5300 w
(dump) 3054 5300 w
(processes) 3404 5300 w
(gives) 3975 5300 w
(the) 4292 5300 w
(\(unused\)) 4505 5300 w
(opportu\255) 5010 5300 w
(nity to optimize) 720 5430 w
(the) 1599 5430 w
(ordering of) 1805 5430 w
11 /LucidaTypewriter f
(w-address) 2439 5430 w
11 /LucidaSansUnicode00 f
(es.) 3150 5430 w
11 /LucidaSans-Demi f
(11.) 720 5690 w
(References) 958 5690 w
11 /LucidaSansUnicode00 f
([1]K.) 720 5860 w
(Thompson,) 1012 5860 w
11 /LucidaSansUnicode20 f
(\034) 1657 5860 w
11 /LucidaSansUnicode00 f
(The) 1698 5860 w
(Plan) 1941 5860 w
(9) 2208 5860 w
(File) 2322 5860 w
(Server) 2552 5860 w
11 /LucidaSansUnicode20 f
(\035) 2882 5860 w
11 /LucidaSansUnicode00 f
(,) 2923 5860 w
(Plan) 3003 5860 w
(9) 3270 5860 w
(Programmer) 3384 5860 w
11 /LucidaSansUnicode20 f
(\031) 4042 5860 w
11 /LucidaSansUnicode00 f
(s) 4077 5860 w
(Manual,) 4178 5860 w
(Second) 4643 5860 w
(Edition,) 5069 5860 w
(volume) 720 5990 w
(2, AT&T Bell) 1143 5990 w
(Laboratories, Murry Hill, NJ, 1995.) 1833 5990 w
([2]K.) 720 6160 w
(Thompson,) 1054 6160 w
(G.) 1742 6160 w
(Collyer,) 1943 6160 w
11 /LucidaSansUnicode20 f
(\034) 2436 6160 w
11 /LucidaSansUnicode00 f
(The) 2477 6160 w
(64-Bit) 2763 6160 w
(Standalone) 3189 6160 w
(Plan) 3864 6160 w
(9) 4173 6160 w
(File) 4329 6160 w
(Server) 4601 6160 w
11 /LucidaSansUnicode20 f
(\035) 4931 6160 w
11 /LucidaSansUnicode00 f
(,) 4972 6160 w
(Plan) 5094 6160 w
(9) 5403 6160 w
(Programmer) 720 6290 w
11 /LucidaSansUnicode20 f
(\031) 1378 6290 w
11 /LucidaSansUnicode00 f
(s) 1413 6290 w
(Manual,) 1514 6290 w
(Fourth) 1979 6290 w
(Edition,) 2372 6290 w
(volume) 2820 6290 w
(2,) 3252 6290 w
(AT&T) 3400 6290 w
(Bell) 3735 6290 w
(Laboratories,) 3969 6290 w
(Murry) 4712 6290 w
(Hill,) 5066 6290 w
(NJ,) 5322 6290 w
(2002.) 720 6420 w
([3]S.) 720 6590 w
(Quinlan,) 1002 6590 w
11 /LucidaSansUnicode20 f
(\034) 1499 6590 w
11 /LucidaSansUnicode00 f
(A) 1540 6590 w
(Cached) 1663 6590 w
(WORM) 2102 6590 w
(File) 2494 6590 w
(System) 2726 6590 w
11 /LucidaSansUnicode20 f
(\035) 3103 6590 w
11 /LucidaSansUnicode00 f
(,) 3144 6590 w
11 /LucidaSans-Italic f
(Software) 3226 6590 w
11 /LucidaSansUnicode20 f
(\024) 3746 6590 w
11 /LucidaSans-Italic f
(Practice) 3904 6590 w
(and) 4378 6590 w
(Experience) 4628 6590 w
11 /LucidaSansUnicode00 f
(,) 5197 6590 w
(vol\255) 5280 6590 w
(ume) 720 6720 w
(21, number 12, pp. 1289) 987 6720 w
11 /LucidaSansUnicode20 f
(\024) 2336 6720 w
11 /LucidaSansUnicode00 f
(99.) 2446 6720 w
([4]S.) 720 6890 w
(Hopkins,) 1140 6890 w
(B.) 1797 6890 w
(Coile,) 2081 6890 w
11 /LucidaSansUnicode20 f
(\034) 2571 6890 w
11 /LucidaSansUnicode00 f
(ATA) 2612 6890 w
(over) 3019 6890 w
(Ethernet) 3436 6890 w
11 /LucidaSansUnicode20 f
(\035) 3882 6890 w
11 /LucidaSansUnicode00 f
(,) 3923 6890 w
(published) 4144 6890 w
(online) 4855 6890 w
(at) 5370 6890 w
(http://www.coraid.com/documents/AoEr10.txt) 720 7020 w
([5]A.) 720 7190 w
(Tanenbaum) 1022 7190 w
11 /LucidaSans-Italic f
(Operating) 1700 7190 w
(Systems,) 2290 7190 w
(design) 2808 7190 w
(and) 3205 7190 w
(implementation) 3458 7190 w
11 /LucidaSansUnicode00 f
(,) 4291 7190 w
(Prentice) 4377 7190 w
(Hall,) 4855 7190 w
(Engle\255) 5147 7190 w
(wood Cliffs, New) 720 7320 w
(Jersey, 1987, p. 272.) 1654 7320 w
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11 /LucidaSansUnicode00 f
([6]Diskless Fileserver source) 720 850 w
(code) 2273 850 w
(at) 2562 850 w
(/n/sources/contrib/quanstro/src/myfs.) 2699 850 w
([7]D. Presotto, P. Winterbottom, The) 720 1020 w
(Organization of) 2689 1020 w
(Networks in Plan 9) 3559 1020 w
11 /LucidaSans-Italic f
(Proc. of) 4591 1020 w
(the) 5036 1020 w
(Win\255) 5240 1020 w
(ter) 720 1150 w
(1993 USENIX Conf) 908 1150 w
11 /LucidaSansUnicode00 f
(., pp. 271-280, San Diego, CA) 1881 1150 w
([8]Modified 9load source) 720 1320 w
(code) 2085 1320 w
(at) 2374 1320 w
(/n/sources/contrib/quanstro/src/9loadaoe.) 2511 1320 w
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