*1 x Node*: r...@n1:~# dd if=/dev/sdc1 of=/dev/null bs=1M count=1000 skip=2000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 10.9246 s, 96.0 MB/s *2 x Nodes* r...@n1:/cfs1/laurence# cat run.sh.e7470.1 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 18.6313 s, 56.3 MB/s r...@n1:/cfs1/laurence# cat run.sh.e7470.2 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 19.0982 s, 54.9 MB/s real 0m21.557s user 0m0.010s sys 0m0.000s *5 x Nodes* run.sh.e7471.1:1048576000 bytes (1.0 GB) copied, 45.7561 s, 22.9 MB/s run.sh.e7471.2:1048576000 bytes (1.0 GB) copied, 43.3075 s, 24.2 MB/s run.sh.e7471.3:1048576000 bytes (1.0 GB) copied, 38.9945 s, 26.9 MB/s run.sh.e7471.4:1048576000 bytes (1.0 GB) copied, 43.535 s, 24.1 MB/s run.sh.e7471.5:1048576000 bytes (1.0 GB) copied, 41.4462 s, 25.3 MB/s real 0m49.552s user 0m0.000s sys 0m0.010s *8 x Nodes:* run.sh.e7472.1:1048576000 bytes (1.0 GB) copied, 60.7164 s, 17.3 MB/s run.sh.e7472.2:1048576000 bytes (1.0 GB) copied, 50.3527 s, 20.8 MB/s run.sh.e7472.3:1048576000 bytes (1.0 GB) copied, 57.4285 s, 18.3 MB/s run.sh.e7472.4:1048576000 bytes (1.0 GB) copied, 47.4362 s, 22.1 MB/s run.sh.e7472.5:1048576000 bytes (1.0 GB) copied, 61.4835 s, 17.1 MB/s run.sh.e7472.6:1048576000 bytes (1.0 GB) copied, 48.5347 s, 21.6 MB/s run.sh.e7472.7:1048576000 bytes (1.0 GB) copied, 63.9391 s, 16.4 MB/s run.sh.e7472.8:1048576000 bytes (1.0 GB) copied, 60.6223 s, 17.3 MB/s real 1m7.497s user 0m0.010s sys 0m0.010s *10 x Nodes:* run.sh.e7473.1:1048576000 bytes (1.0 GB) copied, 58.4126 s, 18.0 MB/s run.sh.e7473.10:1048576000 bytes (1.0 GB) copied, 50.982 s, 20.6 MB/s run.sh.e7473.2:1048576000 bytes (1.0 GB) copied, 53.1949 s, 19.7 MB/s run.sh.e7473.3:1048576000 bytes (1.0 GB) copied, 48.3755 s, 21.7 MB/s run.sh.e7473.4:1048576000 bytes (1.0 GB) copied, 60.8544 s, 17.2 MB/s run.sh.e7473.5:1048576000 bytes (1.0 GB) copied, 59.9801 s, 17.5 MB/s run.sh.e7473.6:1048576000 bytes (1.0 GB) copied, 61.6221 s, 17.0 MB/s run.sh.e7473.7:1048576000 bytes (1.0 GB) copied, 59.2011 s, 17.7 MB/s run.sh.e7473.8:1048576000 bytes (1.0 GB) copied, 56.3118 s, 18.6 MB/s run.sh.e7473.9:1048576000 bytes (1.0 GB) copied, 54.2202 s, 19.3 MB/s real 1m6.979s user 0m0.010s sys 0m0.010s Do you think the hardware cannot handle the load?
On Tue, Sep 15, 2009 at 7:53 PM, Sunil Mushran <[email protected]>wrote: > All clusters are running release tests. So not at the moment. > > But you can see if your hardware is limiting you. > > # time dd if=/dev/sdX1 of=/dev/null bs=1M count=1000 skip=2000 > > Run this on one node, then two nodes concurrently, 5 nodes, 10 nodes. > The idea is to see whether you see any drop off in read performance > when multiple nodes are hitting the iscsi io stack. > > # echo 3 > /proc/sys/vm/drop_caches > Do remember to clear the caches between runs. > > Sunil > > > Laurence Mayer wrote: > >> Hi Sunil >> I am running iostat on only one of the nodes, so the results you see is >> only from a single node. >> However I am running this concurrently on the 10 nodes, resulting in a >> total of 2Gig being written, so yes on this node >> it took 8 secs to write 205Megs. >> >> My latest results (using sync after the dd) show that when running on the >> 10 nodes concurrently it take 37secs >> to write the 10 x 205Meg files (2Gig), >> Here are the results from ALL the nodes: >> run.sh.e7212.1:204800000 bytes (205 MB) copied, 17.9657 s, 11.4 MB/s >> run.sh.e7212.10:204800000 bytes (205 MB) copied, 30.1489 s, 6.8 MB/s >> run.sh.e7212.2:204800000 bytes (205 MB) copied, 16.4605 s, 12.4 MB/s >> run.sh.e7212.3:204800000 bytes (205 MB) copied, 18.1461 s, 11.3 MB/s >> run.sh.e7212.4:204800000 bytes (205 MB) copied, 20.9716 s, 9.8 MB/s >> run.sh.e7212.5:204800000 bytes (205 MB) copied, 22.6265 s, 9.1 MB/s >> run.sh.e7212.6:204800000 bytes (205 MB) copied, 12.9318 s, 15.8 MB/s >> run.sh.e7212.7:204800000 bytes (205 MB) copied, 15.1739 s, 13.5 MB/s >> run.sh.e7212.8:204800000 bytes (205 MB) copied, 13.8953 s, 14.7 MB/s >> run.sh.e7212.9:204800000 bytes (205 MB) copied, 29.5445 s, 6.9 MB/s >> >> real 0m37.920s >> user 0m0.000s >> sys 0m0.030s >> >> (This averages 11.17MB/sec per node, which seems very low.) >> >> compared to 23.5secs when writing 2Gig from a single node. >> >> r...@n2:# time (dd if=/dev/zero of=txt bs=2048000 count=1000; sync) >> 1000+0 records in >> 1000+0 records out >> 2048000000 bytes (2.0 GB) copied, 16.1369 s, 127 MB/s >> >> real 0m23.495s >> user 0m0.000s >> sys 0m15.180s >> >> >> Sunil, do you have any way to run the same test (10 x 200Megs) >> concurrently on 10 or more nodes to compare results? >> >> Thanks again >> >> Laurence >> >> >> Sunil Mushran wrote: >> >>> Always cc ocfs2-users. >>> >>> Strange. The ocfs2 numbers look incomplete. It shows only 200MB written. >>> You said it was taking 16 secs. Yet the iostat numbers are for 8 secs >>> only. >>> >>> The xfs numbers look complete. Shows 90+ MB/s. >>> >>> On my iscsi setup (netapp backend, gige, node with single cpu box and >>> 512M RAM), I get 85MB/s. >>> >>> # time (dd if=/dev/zero of=/mnt/boq7 count=2000 bs=1M ; sync ;) >>> sync >>> 2000+0 records in >>> 2000+0 records out >>> 2097152000 bytes (2.1 GB) copied, 24.4168 seconds, 85.9 MB/s >>> >>> real 0m24.515s >>> user 0m0.035s >>> sys 0m14.967s >>> >>> This is with data=writeback. >>> >>> The 2.2 secs is probably because of delayed allocation. Since your box >>> has >>> enough memory, xfs can cache all the writes and return to the user. Its >>> writeback then flushes the data in the background. The iostat/vmstat >>> numbers should show similar writeback numbers. >>> >>> Sunil >>> >>> Laurence Mayer wrote: >>> >>>> iostat from cfs volume >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 1.77 2.28 0.00 95.95 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 4.00 2.00 4.00 16.00 64.00 >>>> 13.33 0.12 15.00 15.00 9.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 6.90 7.14 0.00 85.96 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 16.00 9.00 40.00 75.00 441.00 >>>> 10.53 0.43 9.39 6.73 33.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 7.67 7.18 0.00 85.15 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 20.00 11.00 47.00 88.00 536.00 >>>> 10.76 0.36 6.21 4.48 26.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 5.65 10.07 0.00 84.28 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 16.00 9.00 37.00 75.00 417.00 >>>> 10.70 0.55 11.96 8.48 39.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.25 0.00 12.69 31.22 0.00 55.84 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 40324.00 2.00 181.00 16.00 174648.00 >>>> 954.45 94.58 364.86 4.81 88.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 13.35 14.14 0.00 72.51 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 9281.00 1.00 228.00 11.00 224441.00 >>>> 980.14 100.93 559.17 4.37 100.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 0.25 0.50 0.00 99.25 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 0.00 0.00 3.00 0.00 1040.00 >>>> 346.67 0.03 240.00 6.67 2.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 0.00 0.00 0.00 100.00 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 0.00 1.00 1.00 11.00 1.00 >>>> 6.00 0.04 20.00 20.00 4.00 >>>> >>>> vmstat from cfs volume: >>>> procs -----------memory---------- ---swap-- -----io---- -system-- >>>> ----cpu---- >>>> r b swpd free buff cache si so bi bo in cs us sy >>>> id wa >>>> 0 0 0 447656 279416 15254408 0 0 0 0 39 350 0 >>>> 0 100 0 >>>> 0 0 0 447656 279416 15254408 0 0 5 21 61 358 0 >>>> 0 100 0 >>>> 0 0 0 447656 279416 15254408 0 0 0 0 49 369 0 >>>> 0 100 0 >>>> 0 0 0 447656 279416 15254408 0 0 6 0 28 318 0 >>>> 0 100 0 >>>> 0 0 0 447656 279416 15254408 0 0 0 0 26 321 0 >>>> 0 100 0 >>>> 0 0 0 447656 279416 15254408 0 0 5 1 45 339 0 >>>> 0 100 0 >>>> 0 0 0 447656 279416 15254412 0 0 0 0 8 283 0 >>>> 0 100 0 >>>> 0 1 0 439472 279424 15262604 0 0 14 80 93 379 0 >>>> 1 90 9 >>>> 0 0 0 439472 279424 15262604 0 0 0 4 43 338 0 >>>> 0 97 2 >>>> 0 0 0 382312 279456 15319964 0 0 37 209 208 562 0 >>>> 7 85 8 >>>> 0 0 0 324524 279500 15377292 0 0 44 264 250 647 0 >>>> 7 86 7 >>>> 0 0 0 266864 279532 15434636 0 0 38 208 213 548 0 >>>> 7 83 10 >>>> 0 3 0 250072 279544 15450584 0 0 44 124832 13558 2038 0 >>>> 11 62 27 >>>> 0 1 0 250948 279564 15450584 0 0 5 75341 19596 2735 0 >>>> 13 71 16 >>>> 0 0 0 252808 279564 15450548 0 0 0 52 2777 849 0 >>>> 2 95 3 >>>> 0 0 0 252808 279564 15450548 0 0 6 0 21 310 0 >>>> 0 100 0 >>>> 0 0 0 252808 279564 15450548 0 0 0 0 15 298 0 >>>> 0 100 0 >>>> 0 0 0 253012 279564 15450548 0 0 5 1 29 310 0 >>>> 0 100 0 >>>> 0 0 0 253048 279564 15450552 0 0 0 0 19 290 0 >>>> 0 100 0 >>>> 0 0 0 253048 279564 15450552 0 0 6 0 26 305 0 >>>> 0 100 0 >>>> 1 0 0 253172 279564 15450552 0 0 0 60 28 326 0 >>>> 0 100 0 >>>> xfs volume: >>>> iostat >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdd 0.00 0.00 4.00 0.00 40.00 0.00 >>>> 10.00 0.05 12.00 12.00 4.80 >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 14.98 0.25 0.00 84.77 >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdd 0.00 0.00 3.00 5.00 24.00 3088.00 >>>> 389.00 6.54 44.00 17.00 13.60 >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 10.67 21.86 0.00 67.47 >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdd 0.00 1.00 0.00 221.00 0.00 202936.00 >>>> 918.26 110.51 398.39 4.52 100.00 >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 4.92 21.84 0.00 73.23 >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdd 0.00 2.00 0.00 232.00 0.00 209152.00 >>>> 901.52 110.67 493.50 4.31 100.00 >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 3.67 22.78 0.00 73.54 >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdd 0.00 1.00 0.00 215.00 0.00 185717.00 >>>> 863.80 111.37 501.67 4.65 100.00 >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.12 0.00 6.24 12.61 0.00 81.02 >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdd 0.00 1.00 0.00 200.00 0.00 178456.00 >>>> 892.28 80.01 541.82 4.88 97.60 >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.12 0.00 4.61 8.34 0.00 86.92 >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdd 0.00 0.00 0.00 179.00 0.00 183296.00 >>>> 1024.00 134.56 470.61 5.21 93.20 >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 4.25 9.96 0.00 85.79 >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >>>> avgrq-sz avgqu-sz await svctm %util >>>> sdd 0.00 0.00 0.00 201.00 0.00 205824.00 >>>> 1024.00 142.86 703.92 4.98 100.00 >>>> vmstat >>>> procs -----------memory---------- ---swap-- -----io---- -system-- >>>> ----cpu---- >>>> r b swpd free buff cache si so bi bo in cs us sy >>>> id wa >>>> 1 0 45396 214592 6332 31771312 0 0 668 908 3 6 3 >>>> 2 92 3 >>>> 0 0 45396 214460 6332 31771336 0 0 0 0 14 4874 0 >>>> 0 100 0 >>>> 2 0 45396 161032 6324 31822524 0 0 20 0 42 6074 0 >>>> 13 87 0 >>>> 5 1 45396 166380 6324 31820072 0 0 12 77948 8166 6416 0 >>>> 16 77 7 >>>> 1 2 45396 163176 6324 31824580 0 0 28 102920 24190 6660 0 >>>> 6 73 21 >>>> 0 2 45396 163096 6332 31824580 0 0 0 102743 22576 6700 0 >>>> 5 72 23 >>>> 0 2 45396 163076 6332 31824580 0 0 0 90400 21831 6500 0 >>>> 4 76 21 >>>> 0 1 45396 163012 6332 31824580 0 0 0 114732 19686 5894 0 >>>> 7 83 10 >>>> 0 1 45396 162972 6332 31824580 0 0 0 98304 24882 6314 0 >>>> 4 87 8 >>>> 0 1 45396 163064 6332 31824580 0 0 0 98304 24118 6285 0 >>>> 4 84 12 >>>> 0 1 45396 163096 6340 31824576 0 0 0 114720 24800 6166 0 >>>> 4 87 9 >>>> 0 1 45396 162964 6340 31824584 0 0 0 98304 24829 6105 0 >>>> 3 85 12 >>>> 0 1 45396 162856 6340 31824584 0 0 0 98304 23506 6402 0 >>>> 5 83 12 >>>> 0 1 45396 162888 6340 31824584 0 0 0 114688 24685 7057 0 >>>> 4 87 9 >>>> 0 1 45396 162600 6340 31824584 0 0 0 98304 24902 7107 0 >>>> 4 86 10 >>>> 0 1 45396 162740 6340 31824584 0 0 0 98304 24906 7019 0 >>>> 4 91 6 >>>> 0 1 45396 162616 6348 31824584 0 0 0 114728 24997 7169 0 >>>> 4 86 9 >>>> 0 1 45396 162896 6348 31824584 0 0 0 98304 23700 6857 0 >>>> 4 85 11 >>>> 0 1 45396 162732 6348 31824584 0 0 0 94512 24468 6995 0 >>>> 3 89 8 >>>> 0 1 45396 162836 6348 31824584 0 0 0 81920 19764 6604 0 >>>> 7 81 11 >>>> 0 3 45396 162996 6348 31824584 0 0 0 114691 24303 7270 0 >>>> 4 81 14 >>>> procs -----------memory---------- ---swap-- -----io---- -system-- >>>> ----cpu---- >>>> r b swpd free buff cache si so bi bo in cs us sy >>>> id wa >>>> 0 1 45396 163160 6356 31824584 0 0 0 98332 22695 7174 0 >>>> 4 78 18 >>>> 0 1 45396 162848 6356 31824584 0 0 0 90549 24836 7347 0 >>>> 4 82 15 >>>> 1 0 45396 163092 6364 31824580 0 0 0 37 13990 6216 0 >>>> 6 83 11 >>>> 0 0 45396 163272 6364 31824588 0 0 0 320 65 3817 0 >>>> 0 100 0 >>>> 0 0 45396 163272 6364 31824588 0 0 0 0 8 3694 0 >>>> 0 100 0 >>>> 0 0 45396 163272 6364 31824588 0 0 0 0 25 3833 0 >>>> 0 100 0 >>>> 0 0 45396 163272 6364 31824588 0 0 0 1 13 3690 0 >>>> 0 100 0 >>>> >>>> On Mon, Sep 14, 2009 at 10:15 PM, Sunil Mushran < >>>> [email protected] <mailto:[email protected]>> wrote: >>>> >>>> Add a sync. Both utils are showing very little io. And do the same >>>> for runs on both ocfs2 and xfs. >>>> >>>> # dd if... ; sync; >>>> >>>> Laurence Mayer wrote: >>>> >>>> Here is the output of iostat while running the test on all the >>>> OCFS volume. >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.23 0.00 15.80 0.45 0.00 83.52 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s >>>> wsec/s avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 4.00 5.00 4.00 43.00 >>>> 57.00 11.11 0.08 8.89 8.89 8.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.28 0.00 4.46 0.00 0.00 95.26 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s >>>> wsec/s avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 0.00 0.00 0.00 0.00 >>>> 0.00 0.00 0.00 0.00 0.00 0.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.25 0.00 0.25 3.23 0.00 96.28 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s >>>> wsec/s avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 7.00 1.00 13.00 11.00 >>>> 153.00 11.71 0.24 17.14 11.43 16.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 0.00 0.00 0.00 100.00 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s >>>> wsec/s avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 0.00 0.00 0.00 0.00 >>>> 0.00 0.00 0.00 0.00 0.00 0.00 >>>> >>>> avg-cpu: %user %nice %system %iowait %steal %idle >>>> 0.00 0.00 0.00 0.00 0.00 100.00 >>>> >>>> Device: rrqm/s wrqm/s r/s w/s rsec/s >>>> wsec/s avgrq-sz avgqu-sz await svctm %util >>>> sdc 0.00 0.00 1.00 1.00 11.00 >>>> 1.00 6.00 0.03 15.00 15.00 3.00 >>>> >>>> vmstat: >>>> procs -----------memory---------- ---swap-- -----io---- >>>> -system-- ----cpu---- >>>> r b swpd free buff cache si so bi bo in >>>> cs us sy id wa >>>> 0 0 0 54400 279320 15651312 0 0 9 8 2 >>>> 4 30 1 69 0 >>>> 0 0 0 54384 279320 15651316 0 0 6 0 24 >>>> 299 0 0 100 0 >>>> 0 0 0 54384 279320 15651316 0 0 0 0 92 >>>> 409 0 0 100 0 >>>> 2 0 0 54384 279320 15651316 0 0 5 1 81 >>>> 386 0 0 100 0 >>>> 0 0 0 53756 279320 15651352 0 0 8 0 730 >>>> 1664 0 1 99 0 >>>> 0 0 0 53232 279320 15651352 0 0 6 88 586 >>>> 1480 0 0 99 0 >>>> 0 0 0 242848 279320 15458608 0 0 8 0 348 >>>> 1149 0 3 97 0 >>>> 0 0 0 242868 279320 15458608 0 0 5 1 220 >>>> 721 0 0 100 0 >>>> 0 0 0 242868 279320 15458608 0 0 0 0 201 >>>> 709 0 0 100 0 >>>> 0 0 0 243116 279320 15458608 0 0 6 0 239 >>>> 775 0 0 100 0 >>>> 0 0 0 243116 279320 15458608 0 0 0 0 184 >>>> 676 0 0 100 0 >>>> 0 0 0 243116 279336 15458608 0 0 5 65 236 >>>> 756 0 0 99 0 >>>> 0 0 0 243488 279336 15458608 0 0 0 0 231 >>>> 791 0 0 100 0 >>>> 1 0 0 243488 279336 15458608 0 0 6 0 193 >>>> 697 0 1 100 0 >>>> 0 0 0 243488 279336 15458608 0 0 0 0 221 >>>> 762 0 0 100 0 >>>> 0 0 0 243860 279336 15458608 0 0 9 1 240 >>>> 793 0 0 100 0 >>>> 0 0 0 243860 279336 15458608 0 0 0 0 197 >>>> 708 0 0 100 0 >>>> 1 0 0 117384 279348 15585384 0 0 26 16 124 >>>> 524 0 15 84 1 >>>> 0 0 0 53204 279356 15651364 0 0 0 112 141 >>>> 432 0 8 91 1 >>>> 0 0 0 53212 279356 15651320 0 0 5 1 79 >>>> 388 0 0 100 0 >>>> 0 0 0 53212 279356 15651320 0 0 0 20 30 >>>> 301 0 0 100 0 >>>> Does this give you any clue to the bottle neck? >>>> On Mon, Sep 14, 2009 at 9:42 PM, Sunil Mushran >>>> <[email protected] <mailto:[email protected]> >>>> <mailto:[email protected] >>>> <mailto:[email protected]>>> wrote: >>>> >>>> Get some iostat/vmstat numbers. >>>> # iostat -x /dev/sdX 1 >>>> # vmstat 1 >>>> >>>> How much memory do the nodes have? If more than 2G, XFS >>>> is probably leveraging its delayed allocation feature to >>>> heavily >>>> cache the writes. iostat/vmstat should show that. >>>> >>>> Is the timing for the 10 node test cumulative? >>>> >>>> Laurence Mayer wrote: >>>> >>>> Hi, >>>> >>>> I am currently running a 10 Node OCFS2 Cluster (version >>>> 1.3.9-0ubuntu1) on Ubuntu Server 8.04 x86_64. >>>> Linux n1 2.6.24-24-server #1 SMP Tue Jul 7 19:39:36 UTC >>>> 2009 >>>> x86_64 GNU/Linux >>>> >>>> The Cluster is connected to a 1Tera iSCSI Device >>>> presented by >>>> an IBM 3300 Storage System, running over a 1Gig Network. >>>> Mounted on all nodes: /dev/sdc1 on /cfs1 type ocfs2 >>>> (rw,_netdev,data=writeback,heartbeat=local) >>>> Maximum Nodes: 32 >>>> Block Size=4k >>>> Cluster Size=4k >>>> >>>> My testing shows that to write simultaneously from the 10 >>>> nodes, 10 x 200Meg files (1 file per node, total of 2Gig) >>>> takes ~23.54secs. >>>> Reading the files back can take just as long. >>>> >>>> Do these numbers sound correct? >>>> >>>> Doing dd if=/dev/zero of=/cfs1/xxxxx/txt count=1000 >>>> bs=2048000 >>>> (2Gig) from a single node takes 16secs. >>>> >>>> (running the same dd command on an XFS filesystem >>>> connected to >>>> the same iSCSI Storage takes 2.2secs) >>>> >>>> Is there any tips & tricks to improve performance on >>>> OCFS2? >>>> >>>> Thanks in advance >>>> Laurence >>>> >>>> _______________________________________________ >>>> Ocfs2-users mailing list >>>> [email protected] >>>> <mailto:[email protected]> >>>> <mailto:[email protected] >>>> <mailto:[email protected]>> >>>> >>>> http://oss.oracle.com/mailman/listinfo/ocfs2-users >>>> >>>> >>>> >>> >
_______________________________________________ Ocfs2-users mailing list [email protected] http://oss.oracle.com/mailman/listinfo/ocfs2-users
