[Ocfs2-users] 10 Node OCFS2 Cluster - Performance
Laurence Mayer
laurence at istraresearch.com
Tue Sep 15 10:50:03 PDT 2009
*1 x Node*:
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# 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# 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>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>> 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>>> 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 at oss.oracle.com
>>>> <mailto:Ocfs2-users at oss.oracle.com>
>>>> <mailto:Ocfs2-users at oss.oracle.com
>>>> <mailto:Ocfs2-users at oss.oracle.com>>
>>>>
>>>> http://oss.oracle.com/mailman/listinfo/ocfs2-users
>>>>
>>>>
>>>>
>>>
>
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