Is the o2cb interconnect and iscsi sharing the same network channel? Laurence Mayer wrote: > *1 x Node*: > r...@n1 <mailto: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 <mailto: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 <mailto: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 > <sunil.mush...@oracle.com <mailto:sunil.mush...@oracle.com>> 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 > <sunil.mush...@oracle.com > <mailto:sunil.mush...@oracle.com> > <mailto:sunil.mush...@oracle.com > <mailto:sunil.mush...@oracle.com>>> 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 > <sunil.mush...@oracle.com > <mailto:sunil.mush...@oracle.com> > <mailto:sunil.mush...@oracle.com > <mailto:sunil.mush...@oracle.com>> > <mailto:sunil.mush...@oracle.com > <mailto:sunil.mush...@oracle.com> > <mailto:sunil.mush...@oracle.com > <mailto:sunil.mush...@oracle.com>>>> 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 > Ocfs2-users@oss.oracle.com > <mailto:Ocfs2-users@oss.oracle.com> > <mailto:Ocfs2-users@oss.oracle.com > <mailto:Ocfs2-users@oss.oracle.com>> > <mailto:Ocfs2-users@oss.oracle.com > <mailto:Ocfs2-users@oss.oracle.com> > <mailto:Ocfs2-users@oss.oracle.com > <mailto:Ocfs2-users@oss.oracle.com>>> > > > http://oss.oracle.com/mailman/listinfo/ocfs2-users > > > > >
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