[Gluster-users] Slow read performance
Thomas Wakefield
twake at iges.org
Fri Mar 1 14:58:19 UTC 2013
The max setting for performance.read-ahead-page-count is 16, which I did just try. No significant change.
Any other setting options?
On Feb 28, 2013, at 10:18 PM, Anand Avati <anand.avati at gmail.com> wrote:
> Can you try "gluster volume set <volname> performance.read-ahead-page-count 64" or some value higher or lower?
>
> Avati
>
> On Thu, Feb 28, 2013 at 7:15 PM, Thomas Wakefield <twake at iges.org> wrote:
> Good point, forgot to set a blcoksize, here are the redone dd tests:
>
> [root at cpu_crew1 ~]# dd if=/shared/working/benchmark/test.cpucrew1 of=/dev/null bs=128k
> 40000+0 records in
> 40000+0 records out
> 5242880000 bytes (5.2 GB) copied, 65.4928 seconds, 80.1 MB/s
> [root at cpu_crew1 ~]# dd if=/shared/working/benchmark/test.cpucrew1 of=/dev/null bs=1M
> 5000+0 records in
> 5000+0 records out
> 5242880000 bytes (5.2 GB) copied, 49.0907 seconds, 107 MB/s
> [root at cpu_crew1 ~]# dd if=/shared/working/benchmark/test.cpucrew1 of=/dev/null bs=4M
> 1250+0 records in
> 1250+0 records out
> 5242880000 bytes (5.2 GB) copied, 44.5724 seconds, 118 MB/s
>
> Still not impressive.
>
> -Tom
>
>
> On Feb 28, 2013, at 8:42 PM, Jeff Anderson-Lee <jonah at eecs.berkeley.edu> wrote:
>
>> Thomas,
>>
>> You have not specified a block size, so you are doing a huge number of small(ish) reads with associated round trips. What happens with dd bs=128k ..?
>>
>> Jeff Anderson-Lee
>>
>> On 2/28/2013 5:30 PM, Thomas Wakefield wrote:
>>> Did a fresh dd test just to confirm, same results:
>>>
>>> [root at cpu_crew1 benchmark]# dd if=/dev/zero of=/shared/working/benchmark/test.cpucrew1 bs=512k count=10000
>>> 10000+0 records in
>>> 10000+0 records out
>>> 5242880000 bytes (5.2 GB) copied, 7.43695 seconds, 705 MB/s
>>> [root at cpu_crew1 benchmark]# dd if=/shared/working/benchmark/test.cpucrew1 of=/dev/null
>>> 552126+0 records in
>>> 552125+0 records out
>>> 282688000 bytes (283 MB) copied, 37.8514 seconds, 7.5 MB/s
>>>
>>>
>>>
>>> On Feb 28, 2013, at 8:14 PM, Bryan Whitehead <driver at megahappy.net> wrote:
>>>
>>>> How are you doing the reading? Is this still an iozone benchmark?
>>>>
>>>> if you simply dd if=/glustermount/bigfile of=/dev/null, is the speed better?
>>>>
>>>>
>>>> On Thu, Feb 28, 2013 at 5:05 PM, Thomas Wakefield <twake at iges.org> wrote:
>>>> I get great speed locally, it's only when I add gluster in that it slows down. I get 2GB/s locally to the exact same brick. It's gluster that is having the read issue (80MB/s). But Gluster can write just fine, 800MB/s.
>>>>
>>>> The blockdev idea is a good one, and I have already done it. Thanks though.
>>>>
>>>> -Tom
>>>>
>>>> On Feb 28, 2013, at 7:53 PM, Ling Ho <ling at slac.stanford.edu> wrote:
>>>>
>>>>> Tom,
>>>>>
>>>>> What type of disks do you have? If they are raid 5 or 6, have you try setting the read-ahead size to 8192 or 16384 (blockdev --setra 8192 /dev/<sd?> ?
>>>>>
>>>>> ...
>>>>> ling
>>>>>
>>>>> On 02/28/2013 04:23 PM, Thomas Wakefield wrote:
>>>>>>
>>>>>> Did anyone else have any ideas on performance tuning for reads?
>>>>>>
>>>>>> On Feb 27, 2013, at 9:29 PM, Thomas Wakefield <twake at iges.org> wrote:
>>>>>>
>>>>>>> Bryan-
>>>>>>>
>>>>>>> Yes I can write at 700-800MBytes/sec, but i can only read at 70-80 MBytes/sec. I would be very happy if I could get it to read at the same speed it can write at. And the 70-80 is sequential, not random for reads, same exact test commands on the disk server are in the 2+GB/s range, so I know the disk server can do it.
>>>>>>>
>>>>>>> -Tom
>>>>>>>
>>>>>>>
>>>>>>> On Feb 27, 2013, at 7:41 PM, Bryan Whitehead <driver at megahappy.net> wrote:
>>>>>>>
>>>>>>>> Are your figures 700-800MByte/sec? Because that is probably as fast as your 10G nic cards are able to do. You can test that by trying to push a large amount of data over nc or ftp.
>>>>>>>>
>>>>>>>> Might want to try Infiniband. 40G cards are pretty routine.
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Feb 27, 2013 at 3:45 PM, Thomas Wakefield <twake at iges.org> wrote:
>>>>>>>> I also get the same performance running iozone for large file sizes, iozone -u 1 -r 512k -s 2G -I -F.
>>>>>>>>
>>>>>>>> Large file IO is what I need the system to do. I am just shocked at the huge difference between local IO and gluster client IO. I know there should be some difference, but 10x is unacceptable.
>>>>>>>>
>>>>>>>> -Tom
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Feb 27, 2013, at 5:31 PM, Bryan Whitehead <driver at megahappy.net> wrote:
>>>>>>>>
>>>>>>>>> Every time you open/close a file or a directory you will have to wait for locks which take time. This is totally expected.
>>>>>>>>>
>>>>>>>>> Why don't you share what you want to do? iozone benchmarks look like crap but serving qcow2 files to qemu works fantastic for me. What are you doing? Make a benchmark that does that. If you are going to have many files with a wide variety of sizes glusterfs/fuse might not be what you are looking for.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Wed, Feb 27, 2013 at 12:56 PM, Thomas Wakefield <twake at cola.iges.org> wrote:
>>>>>>>>> I have tested everything, small and large files. I have used file sizes ranging from 128k up to multiple GB files. All the reads are bad.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Here is a fairly exhaustive iozone auto test:
>>>>>>>>>
>>>>>>>>> random random bkwd record stride
>>>>>>>>> KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread
>>>>>>>>> 64 4 40222 63492 26868 30060 1620 71037 1572 70570 31294 77096 72475 14736 13928
>>>>>>>>> 64 8 99207 116366 13591 13513 3214 97690 3155 109978 28920 152018 158480 18936 17625
>>>>>>>>> 64 16 230257 253766 25156 28713 10867 223732 8873 244297 54796 303383 312204 15062 13545
>>>>>>>>> 64 32 255943 234481 5735102 7100397 11897 318502 13681 347801 24214 695778 528618 25838 28094
>>>>>>>>> 64 64 214096 681644 6421025 7100397 27453 292156 28117 621657 27338 376062 512471 28569 32534
>>>>>>>>> 128 4 74329 75468 26428 41089 1131 72857 1118 66976 1597 73778 78343 13351 13026
>>>>>>>>> 128 8 100862 135170 24966 16734 2617 118966 2560 120406 39156 125121 146613 16177 16180
>>>>>>>>> 128 16 115114 253983 28212 17854 5307 246180 5431 229843 47335 255920 271173 27256 24445
>>>>>>>>> 128 32 256042 391360 39848 64258 11329 290230 9905 429563 38176 490380 463696 20917 19219
>>>>>>>>> 128 64 248573 592699 4557257 6812590 19583 452366 29263 603357 42967 814915 692017 76327 37604
>>>>>>>>> 128 128 921183 526444 5603747 5379161 45614 390222 65441 826202 41384 662962 1040839 78526 39023
>>>>>>>>> 256 4 76212 77337 40295 32125 1289 71866 1261 64645 1436 57309 53048 23073 29550
>>>>>>>>> 256 8 126922 141976 26237 25130 2566 128058 2565 138981 2985 125060 133603 22840 24955
>>>>>>>>> 256 16 242883 263636 41850 24371 4902 250009 5290 248792 89353 243821 247303 26965 26199
>>>>>>>>> 256 32 409074 439732 40101 39335 11953 436870 11209 430218 83743 409542 479390 30821 27750
>>>>>>>>> 256 64 259935 571502 64840 71847 22537 617161 23383 392047 91852 672010 802614 41673 53111
>>>>>>>>> 256 128 847597 812329 185517 83198 49383 708831 44668 794889 74267 1180188 1662639 54303 41018
>>>>>>>>> 256 256 481324 709299 5217259 5320671 44668 719277 40954 808050 41302 790209 771473 62224 35754
>>>>>>>>> 512 4 77667 75226 35102 29696 1337 66262 1451 67680 1413 69265 69142 42084 27897
>>>>>>>>> 512 8 134311 144341 30144 24646 2102 134143 2209 134699 2296 108110 128616 25104 29123
>>>>>>>>> 512 16 200085 248787 30235 25697 4196 247240 4179 256116 4768 250003 226436 32351 28455
>>>>>>>>> 512 32 330341 439805 26440 39284 8744 457611 8006 424168 125953 425935 448813 27660 26951
>>>>>>>>> 512 64 483906 733729 48747 41121 16032 555938 17424 587256 187343 366977 735740 41700 41548
>>>>>>>>> 512 128 836636 907717 69359 94921 42443 761031 36828 964378 123165 651383 695697 58368 44459
>>>>>>>>> 512 256 520879 860437 145534 135523 40267 847532 31585 663252 69696 1270846 1492545 48822 48092
>>>>>>>>> 512 512 782951 973118 3099691 2942541 42328 871966 46218 911184 49791 953248 1036527 52723 48347
>>>>>>>>> 1024 4 76218 69362 36431 28711 1137 66171 1174 68938 1125 70566 70845 34942 28914
>>>>>>>>> 1024 8 126045 140524 37836 15664 2698 126000 2557 125566 2567 110858 127255 26764 27945
>>>>>>>>> 1024 16 243398 261429 40238 23263 3987 246400 3882 260746 4093 236652 236874 31429 25076
>>>>>>>>> 1024 32 383109 422076 41731 41605 8277 473441 7775 415261 8588 394765 407306 40089 28537
>>>>>>>>> 1024 64 590145 619156 39623 53267 15051 722717 14624 753000 257294 597784 620946 38619 44073
>>>>>>>>> 1024 128 1077836 1124099 56192 64916 36851 1102176 37198 1082454 281548 829175 792604 47975 51913
>>>>>>>>> 1024 256 941918 1074331 72783 81450 26778 1099636 32395 1060013 183218 1024121 995171 44371 45448
>>>>>>>>> 1024 512 697483 1130312 100324 114682 48215 1041758 41480 1058967 90156 994020 1563622 56328 46370
>>>>>>>>> 1024 1024 931702 1087111 4609294 4199201 44191 949834 45594 970656 56674 933525 1075676 44876 46115
>>>>>>>>> 2048 4 71438 67066 58319 38913 1147 44147 1043 42916 967 66416 67205 45953 96750
>>>>>>>>> 2048 8 141926 134567 61101 55445 2596 77528 2564 80402 4258 124211 120747 53888 100337
>>>>>>>>> 2048 16 254344 255585 71550 74500 5410 139365 5201 141484 5171 205521 213113 67048 57304
>>>>>>>>> 2048 32 397833 411261 56676 80027 10440 260034 10126 230238 10814 391665 383379 79333 60877
>>>>>>>>> 2048 64 595167 687205 64262 87327 20772 456430 19960 477064 23190 540220 563096 86812 92565
>>>>>>>>> 2048 128 833585 933403 121926 118621 37700 690020 37575 733254 567449 712337 734006 92011 104934
>>>>>>>>> 2048 256 799003 949499 143688 125659 40871 892757 37977 880494 458281 836263 901375 131332 110237
>>>>>>>>> 2048 512 979936 1040724 120896 138013 54381 859783 48721 780491 279203 1068824 1087085 97886 98078
>>>>>>>>> 2048 1024 901754 987938 53352 53043 72727 1054522 68269 992275 181253 1309480 1524983 121600 95585
>>>>>>>>> 2048 2048 831890 1021540 4257067 3302797 75672 984203 80181 826209 94278 966920 1027159 111832 105921
>>>>>>>>> 4096 4 66195 67316 62171 74785 1328 28963 1329 26397 1223 71470 69317 55903 84915
>>>>>>>>> 4096 8 122221 120057 90537 60958 2598 47312 2468 59783 2640 128674 127872 41285 40422
>>>>>>>>> 4096 16 238321 239251 29336 32121 4153 89262 3986 96930 4608 229970 237108 55039 56983
>>>>>>>>> 4096 32 417110 421356 30974 50000 8382 156676 7886 153841 7900 359585 367288 26611 25952
>>>>>>>>> 4096 64 648008 668066 32193 29389 14830 273265 14822 282211 19653 581898 620798 51281 50218
>>>>>>>>> 4096 128 779422 848564 55594 60253 37108 451296 35908 491361 37567 738163 728059 67681 66440
>>>>>>>>> 4096 256 865623 886986 71368 63947 44255 645961 42689 719491 736707 819696 837641 57059 60347
>>>>>>>>> 4096 512 852099 889650 68870 73891 31185 845224 30259 830153 392334 910442 961983 60083 55558
>>>>>>>>> 4096 1024 710357 867810 29377 29522 49954 846640 43665 926298 213677 986226 1115445 55130 59205
>>>>>>>>> 4096 2048 826479 908420 43191 42075 59684 904022 58601 855664 115105 1418322 1524415 60548 66066
>>>>>>>>> 4096 4096 793351 855111 3232454 3673419 66018 861413 48833 847852 45914 852268 842075 42980 48374
>>>>>>>>> 8192 4 67340 69421 42198 31740 994 23251 1166 16813 837 73827 73126 25169 29610
>>>>>>>>> 8192 8 137150 125622 29131 36439 2051 44342 1988 48930 2315 134183 135367 31080 33573
>>>>>>>>> 8192 16 237366 220826 24810 26584 3576 88004 3769 78717 4289 233751 235355 23302 28742
>>>>>>>>> 8192 32 457447 454404 31594 27750 8141 142022 7846 143984 9322 353147 396188 34203 33265
>>>>>>>>> 8192 64 670645 655259 28630 23255 16669 237476 16965 244968 15607 590365 575320 49998 43305
>>>>>>>>> 8192 128 658676 760982 44197 47802 28693 379523 26614 378328 27184 720997 702038 51707 49733
>>>>>>>>> 8192 256 643370 698683 56233 63165 28846 543952 27745 576739 44014 701007 725534 59611 58985
>>>>>>>>> 8192 512 696884 776793 67258 52705 18711 698854 21004 694124 621695 784812 773331 43101 47659
>>>>>>>>> 8192 1024 729664 810451 15470 15875 31318 801490 38123 812944 301222 804323 832765 54308 53376
>>>>>>>>> 8192 2048 749217 68757 21914 22667 48971 783309 48132 782738 172848 907408 929324 51156 50565
>>>>>>>>> 8192 4096 707677 763960 32063 31928 47809 751692 49560 786339 93445 1046761 1297876 48037 51680
>>>>>>>>> 8192 8192 623817 746288 2815955 3137358 48722 741633 35428 753787 49626 803683 823800 48977 52895
>>>>>>>>> 16384 4 72372 73651 34471 30788 960 23610 903 22316 891 71445 71138 56451 55129
>>>>>>>>> 16384 8 137920 141704 50830 33857 1935 41934 2275 35588 3608 130757 137801 51621 48525
>>>>>>>>> 16384 16 245369 242460 41808 29770 3605 75682 4355 75315 4767 241100 239693 53263 30785
>>>>>>>>> 16384 32 448877 433956 31846 35010 7973 118181 8819 112703 8177 381734 391651 57749 63417
>>>>>>>>> 16384 64 710831 700712 66792 68864 20176 209806 19034 207852 21255 589503 601379 104567 105162
>>>>>>>>> 16384 128 836901 860867 104226 100373 40899 358865 40946 360562 39415 675968 691538 96086 105695
>>>>>>>>> 16384 256 798081 828146 107103 120433 39084 595325 39050 593110 56925 763466 797859 109645 113414
>>>>>>>>> 16384 512 810851 843931 113564 106202 35111 714831 46244 745947 53636 802902 760172 110492 100879
>>>>>>>>> 16384 1024 726399 820219 22106 22987 53087 749053 54781 777705 1075341 772686 809723 100349 96619
>>>>>>>>> 16384 2048 807772 856458 23920 23617 66320 829576 72105 740848 656379 864539 835446 93499 101714
>>>>>>>>> 16384 4096 797470 840596 27270 28132 88784 834938 83428 836809 342898 953274 969699 96499 100657
>>>>>>>>> 16384 8192 760063 812942 41022 40014 102020 812135 104063 820346 229870 1252409 1398306 100959 103793
>>>>>>>>> 16384 16384 743107 825054 3074035 3551062 97740 826175 103597 803926 94681 820474 829106 97168 92018
>>>>>>>>> 32768 64 713528 714585 71310 74296 21135 194177 21551 202998 21110 571030 595232 98598 103373
>>>>>>>>> 32768 128 766698 820615 103028 102269 39013 328409 40325 346403 41084 684604 702513 103887 100689
>>>>>>>>> 32768 256 766591 819138 107557 113878 42088 574878 41778 557989 55045 749922 754434 100964 104866
>>>>>>>>> 32768 512 774365 846915 104255 106094 35280 728957 25829 734316 26990 750614 800955 55013 63750
>>>>>>>>> 32768 1024 759113 806241 22033 22622 37322 761870 45003 766950 54519 755666 741339 70018 66255
>>>>>>>>> 32768 2048 797566 860344 22893 23859 49973 778872 53509 779539 796674 817078 797585 56750 57047
>>>>>>>>> 32768 4096 796693 798985 24267 25222 54410 781810 53053 802845 421421 832858 855811 56748 60507
>>>>>>>>> 32768 8192 741543 795144 29254 29150 58678 830011 55545 833914 221323 914182 952916 56120 60014
>>>>>>>>> 32768 16384 754641 819797 44183 45718 67293 785047 65078 807273 132136 1240414 1267713 56585 56167
>>>>>>>>> 65536 64 663333 656588 32211 31925 17324 202043 15477 215981 15496 592126 597188 86431 93969
>>>>>>>>> 65536 128 716218 791603 92035 95614 40330 330127 39295 346542 39469 697385 714453 105094 98327
>>>>>>>>> 65536 256 769283 798701 110285 110085 38404 535730 39939 585023 52402 741206 749899 98671 100106
>>>>>>>>> 65536 512 728151 814516 112550 108873 32284 690164 38911 708244 50047 778669 765303 98333 92728
>>>>>>>>> 65536 1024 773504 827108 21542 20741 45901 775473 57282 807232 69359 770793 766736 101465 100905
>>>>>>>>> 65536 2048 767661 853446 21077 21260 59825 762711 71985 802488 87290 772402 775685 96832 103189
>>>>>>>>> 65536 4096 767669 828165 20681 21480 79798 829757 91755 838367 1379411 791248 783023 106433 112769
>>>>>>>>> 65536 8192 739291 784946 23100 22454 85945 785134 87081 828489 642088 816781 798275 93307 95318
>>>>>>>>> 65536 16384 736401 791669 26345 26384 93082 799356 91419 751766 385721 911919 884688 109668 96374
>>>>>>>>> 131072 64 658361 661211 79790 81016 19460 182084 19325 195428 19553 551809 554426 96581 81979
>>>>>>>>> 131072 128 759806 838994 51063 56976 33624 326699 36329 360593 35679 710602 716538 81725 51819
>>>>>>>>> 131072 256 787375 843763 54664 65031 33847 557817 35093 581552 45163 750234 758452 82704 83472
>>>>>>>>> 131072 512 777460 818049 87831 87110 27994 705621 31860 723071 38483 779489 793068 88281 86068
>>>>>>>>> 131072 1024 737158 782780 19005 18897 36614 735240 38900 812074 52149 746598 762694 74376 82534
>>>>>>>>> 131072 2048 777386 817330 24169 24693 55171 769662 56082 788848 55937 757716 763147 73508 82351
>>>>>>>>> 131072 4096 751757 792201 25283 25173 48455 813945 56557 837418 59578 749106 757939 67846 70964
>>>>>>>>> 131072 8192 743004 796673 20369 20327 88990 780925 95956 777211 951528 762755 739851 70850 69943
>>>>>>>>> 131072 16384 766023 823611 22333 22142 108337 796852 110848 777704 718954 809861 802822 115896 82903
>>>>>>>>> 262144 64 655769 695392 45973 45668 19083 209417 18768 207272 19133 601329 599267 107705 87261
>>>>>>>>> 262144 128 750052 798999 72711 74713 37329 339480 36854 365587 37187 710898 714372 108400 78806
>>>>>>>>> 262144 256 788355 815575 80897 75141 37080 549762 37521 574393 51731 780429 751131 97395 73842
>>>>>>>>> 262144 512 714994 736649 80224 80195 32986 708196 36048 628508 44043 767699 781863 123267 83558
>>>>>>>>> 262144 1024 793541 800826 20200 20428 45599 752027 48232 798229 57011 715643 763691 76741 73211
>>>>>>>>> 262144 2048 699395 782935 20227 20519 65785 779219 80486 803403 93381 650054 712171 115611 108457
>>>>>>>>> 262144 4096 629531 766261 20544 21563 83107 819917 93008 844103 90625 741879 754931 94114 94475
>>>>>>>>> 262144 8192 731695 804112 21158 21589 82987 787869 84858 799483 95127 731822 737397 95950 95160
>>>>>>>>> 262144 16384 703376 802552 21940 22371 87748 777024 90349 779626 1018679 765278 619969 96051 92734
>>>>>>>>> 524288 64 649937 710342 73778 70893 19734 207179 19367 199709 19493 585910 581340 91902 91443
>>>>>>>>> 524288 128 739270 805153 91507 90395 38547 319049 37988 358516 38123 712602 711814 92463 90851
>>>>>>>>> 524288 256 751279 802496 89481 91022 38869 544097 38244 569142 56130 756367 752466 92677 92875
>>>>>>>>> 524288 512 758393 819788 58085 73437 29030 700120 28767 739236 33925 770177 795879 58963 72689
>>>>>>>>> 524288 1024 778385 818368 18822 18639 38774 798827 50898 799492 55679 801849 800917 92778 82686
>>>>>>>>> 524288 2048 780594 834612 19936 19994 63147 769555 63007 802512 66322 772900 771314 86628 93485
>>>>>>>>> 524288 4096 769806 812570 20165 20137 79896 783615 71217 80835 68550 80166 73733 122559 116844
>>>>>>>>> 524288 8192 797504 887823 123824 124513 94520 844880 86441 710319 65077 636713 819868 87765 80121
>>>>>>>>> 524288 16384 788468 858216 92580 117354 109583 850179 63966 856965 121151 789252 805040 123810 119088
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Feb 27, 2013, at 2:46 PM, Bryan Whitehead <driver at megahappy.net> wrote:
>>>>>>>>>
>>>>>>>>>> How are you doing the read/write tests on the fuse/glusterfs mountpoint? Many small files will be slow because all the time is spent coordinating locks.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Wed, Feb 27, 2013 at 9:31 AM, Thomas Wakefield <twake at cola.iges.org> wrote:
>>>>>>>>>> Help please-
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> I am running 3.3.1 on Centos using a 10GB network. I get reasonable write speeds, although I think they could be faster. But my read speeds are REALLY slow.
>>>>>>>>>>
>>>>>>>>>> Executive summary:
>>>>>>>>>>
>>>>>>>>>> On gluster client-
>>>>>>>>>> Writes average about 700-800MB/s
>>>>>>>>>> Reads average about 70-80MB/s
>>>>>>>>>>
>>>>>>>>>> On server-
>>>>>>>>>> Writes average about 1-1.5GB/s
>>>>>>>>>> Reads average about 2-3GB/s
>>>>>>>>>>
>>>>>>>>>> Any thoughts?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Here are some additional details:
>>>>>>>>>>
>>>>>>>>>> Nothing interesting in any of the log files, everything is very quite.
>>>>>>>>>> All servers had no other load, and all clients are performing the same way.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Volume Name: shared
>>>>>>>>>> Type: Distribute
>>>>>>>>>> Volume ID: de11cc19-0085-41c3-881e-995cca244620
>>>>>>>>>> Status: Started
>>>>>>>>>> Number of Bricks: 26
>>>>>>>>>> Transport-type: tcp
>>>>>>>>>> Bricks:
>>>>>>>>>> Brick1: fs-disk2:/storage/disk2a
>>>>>>>>>> Brick2: fs-disk2:/storage/disk2b
>>>>>>>>>> Brick3: fs-disk2:/storage/disk2d
>>>>>>>>>> Brick4: fs-disk2:/storage/disk2e
>>>>>>>>>> Brick5: fs-disk2:/storage/disk2f
>>>>>>>>>> Brick6: fs-disk2:/storage/disk2g
>>>>>>>>>> Brick7: fs-disk2:/storage/disk2h
>>>>>>>>>> Brick8: fs-disk2:/storage/disk2i
>>>>>>>>>> Brick9: fs-disk2:/storage/disk2j
>>>>>>>>>> Brick10: fs-disk2:/storage/disk2k
>>>>>>>>>> Brick11: fs-disk2:/storage/disk2l
>>>>>>>>>> Brick12: fs-disk2:/storage/disk2m
>>>>>>>>>> Brick13: fs-disk2:/storage/disk2n
>>>>>>>>>> Brick14: fs-disk2:/storage/disk2o
>>>>>>>>>> Brick15: fs-disk2:/storage/disk2p
>>>>>>>>>> Brick16: fs-disk2:/storage/disk2q
>>>>>>>>>> Brick17: fs-disk2:/storage/disk2r
>>>>>>>>>> Brick18: fs-disk2:/storage/disk2s
>>>>>>>>>> Brick19: fs-disk2:/storage/disk2t
>>>>>>>>>> Brick20: fs-disk2:/storage/disk2u
>>>>>>>>>> Brick21: fs-disk2:/storage/disk2v
>>>>>>>>>> Brick22: fs-disk2:/storage/disk2w
>>>>>>>>>> Brick23: fs-disk2:/storage/disk2x
>>>>>>>>>> Brick24: fs-disk3:/storage/disk3a
>>>>>>>>>> Brick25: fs-disk3:/storage/disk3b
>>>>>>>>>> Brick26: fs-disk3:/storage/disk3c
>>>>>>>>>> Options Reconfigured:
>>>>>>>>>> performance.write-behind: on
>>>>>>>>>> performance.read-ahead: on
>>>>>>>>>> performance.io-cache: on
>>>>>>>>>> performance.stat-prefetch: on
>>>>>>>>>> performance.quick-read: on
>>>>>>>>>> cluster.min-free-disk: 500GB
>>>>>>>>>> nfs.disable: off
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> sysctl.conf settings for 10GBe
>>>>>>>>>> # increase TCP max buffer size settable using setsockopt()
>>>>>>>>>> net.core.rmem_max = 67108864
>>>>>>>>>> net.core.wmem_max = 67108864
>>>>>>>>>> # increase Linux autotuning TCP buffer limit
>>>>>>>>>> net.ipv4.tcp_rmem = 4096 87380 67108864
>>>>>>>>>> net.ipv4.tcp_wmem = 4096 65536 67108864
>>>>>>>>>> # increase the length of the processor input queue
>>>>>>>>>> net.core.netdev_max_backlog = 250000
>>>>>>>>>> # recommended default congestion control is htcp
>>>>>>>>>> net.ipv4.tcp_congestion_control=htcp
>>>>>>>>>> # recommended for hosts with jumbo frames enabled
>>>>>>>>>> net.ipv4.tcp_mtu_probing=1
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Thomas W.
>>>>>>>>>> Sr. Systems Administrator COLA/IGES
>>>>>>>>>> twake at cola.iges.org
>>>>>>>>>> Affiliate Computer Scientist GMU
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> Gluster-users mailing list
>>>>>>>>>> Gluster-users at gluster.org
>>>>>>>>>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Gluster-users mailing list
>>>>> Gluster-users at gluster.org
>>>>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>>>>
>>>>
>>>> _______________________________________________
>>>> Gluster-users mailing list
>>>> Gluster-users at gluster.org
>>>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Gluster-users mailing list
>>> Gluster-users at gluster.org
>>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>>
>
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>
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