[Ocfs2-users] 10 Node OCFS2 Cluster - Performance
Sunil Mushran
sunil.mushran at oracle.com
Tue Sep 15 10:58:13 PDT 2009
Is the o2cb interconnect and iscsi sharing the same network channel?
Laurence Mayer wrote:
> *1 x Node*:
> root at n1 <mailto:root at 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*
> root at n1:/cfs1/laurence <mailto:root at 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
> root at n1:/cfs1/laurence <mailto:root at 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.mushran at oracle.com <mailto:sunil.mushran at 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.
>
> root at 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.mushran at oracle.com
> <mailto:sunil.mushran at oracle.com>
> <mailto:sunil.mushran at oracle.com
> <mailto:sunil.mushran at 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.mushran at oracle.com
> <mailto:sunil.mushran at oracle.com>
> <mailto:sunil.mushran at oracle.com
> <mailto:sunil.mushran at oracle.com>>
> <mailto:sunil.mushran at oracle.com
> <mailto:sunil.mushran at oracle.com>
> <mailto:sunil.mushran at oracle.com
> <mailto:sunil.mushran at 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
>
>
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