Well, i create ceph cluster with 2 osd ( 1 osd per node), 2 mon, 2 mds.
here is what I did:
ceph osd pool create bench
ceph osd tell \* bench
rados -p bench bench 30 write --no-cleanup
output:
Maintaining 16 concurrent writes of 4194304 bytes for at least 30 seconds.
Object prefix: benchmark_data_host01_11635
sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
0 0 0 0 0 0 - 0
1 16 16 0 0 0 - 0
2 16 37 21 41.9911 42 0.139005 1.08941
3 16 53 37 49.3243 64 0.754114 1.09392
4 16 75 59 58.9893 88 0.284647 0.914221
5 16 89 73 58.3896 56 0.072228 0.881008
6 16 95 79 52.6575 24 1.56959 0.961477
7 16 111 95 54.2764 64 0.046105 1.08791
8 16 128 112 55.9906 68 0.035714 1.04594
9 16 150 134 59.5457 88 0.046298 1.04415
10 16 166 150 59.9901 64 0.048635 0.986384
11 16 176 160 58.1723 40 0.727784 0.988408
12 16 206 190 63.3231 120 0.28869 0.946624
13 16 225 209 64.2976 76 1.34472 0.919464
14 16 263 247 70.5605 152 0.070926 0.90046
15 16 295 279 74.3887 128 0.041517 0.830466
16 16 315 299 74.7388 80 0.296037 0.841527
17 16 333 317 74.5772 72 0.286097 0.849558
18 16 340 324 71.9891 28 0.295084 0.83922
19 16 343 327 68.8317 12 1.46948 0.845797
2012-11-04 17:14:52.090941min lat: 0.035714 max lat: 2.64841 avg lat: 0.861539
sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
20 16 378 362 72.389 140 0.566232 0.861539
21 16 400 384 73.1313 88 0.038835 0.857785
22 16 404 388 70.5344 16 0.801216 0.857002
23 16 413 397 69.0327 36 0.062256 0.86376
24 16 428 412 68.6543 60 0.042583 0.89389
25 16 450 434 69.4277 88 0.383877 0.905833
26 16 472 456 70.1415 88 0.269878 0.898023
27 16 472 456 67.5437 0 - 0.898023
28 16 512 496 70.8448 80 0.056798 0.891163
29 16 530 514 70.8843 72 1.20653 0.898112
30 16 542 526 70.1212 48 0.744383 0.890733
Total time run: 30.174151
Total writes made: 543
Write size: 4194304
Bandwidth (MB/sec): 71.982
Stddev Bandwidth: 38.318
Max bandwidth (MB/sec): 152
Min bandwidth (MB/sec): 0
Average Latency: 0.889026
Stddev Latency: 0.677425
Max latency: 2.94467
Min latency: 0.035714
2012/11/4 Aleksey Samarin <nrg3tik@xxxxxxxxx>:
> Ok!
> Well, I'll take these tests and write about the results.
>
> btw,
> disks are the same, as some may be faster than others?
>
> 2012/11/4 Gregory Farnum <greg@xxxxxxxxxxx>:
>> That's only nine — where are the other three? If you have three slow
>> disks that could definitely cause the troubles you're seeing.
>>
>> Also, what Mark said about sync versus syncfs.
>>
>> On Sun, Nov 4, 2012 at 1:26 PM, Aleksey Samarin <nrg3tik@xxxxxxxxx> wrote:
>>> It`s ok!
>>>
>>> Output:
>>>
>>> 2012-11-04 16:19:23.195891 osd.0 [INF] bench: wrote 1024 MB in blocks
>>> of 4096 KB in 11.441035 sec at 91650 KB/sec
>>> 2012-11-04 16:19:24.981631 osd.1 [INF] bench: wrote 1024 MB in blocks
>>> of 4096 KB in 13.225048 sec at 79287 KB/sec
>>> 2012-11-04 16:19:25.672896 osd.2 [INF] bench: wrote 1024 MB in blocks
>>> of 4096 KB in 13.917157 sec at 75344 KB/sec
>>> 2012-11-04 16:19:28.058517 osd.21 [INF] bench: wrote 1024 MB in blocks
>>> of 4096 KB in 16.453375 sec at 63730 KB/sec
>>> 2012-11-04 16:19:28.715552 osd.22 [INF] bench: wrote 1024 MB in blocks
>>> of 4096 KB in 17.108887 sec at 61288 KB/sec
>>> 2012-11-04 16:19:23.440054 osd.23 [INF] bench: wrote 1024 MB in blocks
>>> of 4096 KB in 11.834639 sec at 88602 KB/sec
>>> 2012-11-04 16:19:24.023650 osd.24 [INF] bench: wrote 1024 MB in blocks
>>> of 4096 KB in 12.418276 sec at 84438 KB/sec
>>> 2012-11-04 16:19:24.617514 osd.25 [INF] bench: wrote 1024 MB in blocks
>>> of 4096 KB in 13.011955 sec at 80585 KB/sec
>>> 2012-11-04 16:19:25.148613 osd.26 [INF] bench: wrote 1024 MB in blocks
>>> of 4096 KB in 13.541710 sec at 77433 KB/sec
>>>
>>> All the best.
>>>
>>> 2012/11/4 Gregory Farnum <greg@xxxxxxxxxxx>:
>>>> [Sorry for the blank email; I missed!]
>>>> On Sun, Nov 4, 2012 at 1:04 PM, Aleksey Samarin <nrg3tik@xxxxxxxxx> wrote:
>>>>> Hi!
>>>>> This command? ceph tell osd \* bench
>>>>> Output: tell target 'osd' not a valid entity name
>>>>
>>>> I guess it's "ceph osd tell \* bench". Try that one. :)
>>>>
>>>>> Well, i did pool by command ceph osd pool create bench2 120
>>>>> This output of rados -p bench2 bench 30 write --no-cleanup
>>>>>
>>>>> rados -p bench2 bench 30 write --no-cleanup
>>>>>
>>>>> Maintaining 16 concurrent writes of 4194304 bytes for at least 30 seconds.
>>>>> Object prefix: benchmark_data_host01_5827
>>>>> sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
>>>>> 0 0 0 0 0 0 - 0
>>>>> 1 16 29 13 51.9885 52 0.489268 0.186749
>>>>> 2 16 52 36 71.9866 92 1.87226 0.711888
>>>>> 3 16 57 41 54.657 20 0.089697 0.697821
>>>>> 4 16 60 44 43.9923 12 1.61868 0.765361
>>>>> 5 16 60 44 35.1941 0 - 0.765361
>>>>> 6 16 60 44 29.3285 0 - 0.765361
>>>>> 7 16 60 44 25.1388 0 - 0.765361
>>>>> 8 16 61 45 22.4964 1 5.89643 0.879384
>>>>> 9 16 62 46 20.4412 4 6.0234 0.991211
>>>>> 10 16 62 46 18.3971 0 - 0.991211
>>>>> 11 16 63 47 17.0883 2 8.79749 1.1573
>>>>> 12 16 63 47 15.6643 0 - 1.1573
>>>>> 13 16 63 47 14.4593 0 - 1.1573
>>>>> 14 16 63 47 13.4266 0 - 1.1573
>>>>> 15 16 63 47 12.5315 0 - 1.1573
>>>>> 16 16 63 47 11.7483 0 - 1.1573
>>>>> 17 16 63 47 11.0572 0 - 1.1573
>>>>> 18 16 63 47 10.4429 0 - 1.1573
>>>>> 19 16 63 47 9.89331 0 - 1.1573
>>>>> 2012-11-04 15:58:15.473733min lat: 0.036475 max lat: 8.79749 avg lat: 1.1573
>>>>> sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
>>>>> 20 16 63 47 9.39865 0 - 1.1573
>>>>> 21 16 63 47 8.95105 0 - 1.1573
>>>>> 22 16 63 47 8.54419 0 - 1.1573
>>>>> 23 16 63 47 8.17271 0 - 1.1573
>>>>> 24 16 63 47 7.83218 0 - 1.1573
>>>>> 25 16 63 47 7.5189 0 - 1.1573
>>>>> 26 16 63 47 7.22972 0 - 1.1573
>>>>> 27 16 81 65 9.62824 4.5 0.076456 4.9428
>>>>> 28 16 118 102 14.5693 148 0.427273 4.34095
>>>>> 29 16 119 103 14.2049 4 1.57897 4.31414
>>>>> 30 16 132 116 15.4645 52 2.25424 4.01492
>>>>> 31 16 133 117 15.0946 4 0.974652 3.98893
>>>>> 32 16 133 117 14.6229 0 - 3.98893
>>>>> Total time run: 32.575351
>>>>> Total writes made: 133
>>>>> Write size: 4194304
>>>>> Bandwidth (MB/sec): 16.331
>>>>>
>>>>> Stddev Bandwidth: 31.8794
>>>>> Max bandwidth (MB/sec): 148
>>>>> Min bandwidth (MB/sec): 0
>>>>> Average Latency: 3.91583
>>>>> Stddev Latency: 7.42821
>>>>> Max latency: 25.24
>>>>> Min latency: 0.036475
>>>>>
>>>>> Im think problem not in pg. This output of ceph pg dump >
>>>>> http://pastebin.com/BqLsyMBC
>>>>
>>>> Well, that did improve it a bit; but yes, I think there's something
>>>> else going on. Just wanted to verify. :)
>>>>
>>>>>
>>>>> I have still no idea.
>>>>>
>>>>> All the best. Alex
>>>>>
>>>>>
>>>>>
>>>>> 2012/11/4 Gregory Farnum <greg@xxxxxxxxxxx>:
>>>>>> On Sun, Nov 4, 2012 at 10:58 AM, Aleksey Samarin <nrg3tik@xxxxxxxxx> wrote:
>>>>>>> Hi all
>>>>>>>
>>>>>>> Im planning use ceph for cloud storage.
>>>>>>> My test setup is 2 servers connected via infiniband 40Gb, 6x2Tb disks per node.
>>>>>>> Centos 6.2
>>>>>>> Ceph 0.52 from http://ceph.com/rpms/el6/x86_64
>>>>>>> This is my config http://pastebin.com/Pzxafnsm
>>>>>>> journal on tmpfs
>>>>>>> well, im create bench pool and test it:
>>>>>>> ceph osd pool create bench
>>>>>>> rados -p bench bench 30 write
>>>>>>>
>>>>>>> Total time run: 43.258228
>>>>>>> Total writes made: 151
>>>>>>> Write size: 4194304
>>>>>>> Bandwidth (MB/sec): 13.963
>>>>>>> Stddev Bandwidth: 26.307
>>>>>>> Max bandwidth (MB/sec): 128
>>>>>>> Min bandwidth (MB/sec): 0
>>>>>>> Average Latency: 4.48605
>>>>>>> Stddev Latency: 8.17709
>>>>>>> Max latency: 29.7957
>>>>>>> Min latency: 0.039435
>>>>>>>
>>>>>>> when i do rados -p bench bench 30 seq
>>>>>>> Total time run: 20.626935
>>>>>>> Total reads made: 275
>>>>>>> Read size: 4194304
>>>>>>> Bandwidth (MB/sec): 53.328
>>>>>>> Average Latency: 1.19754
>>>>>>> Max latency: 7.0215
>>>>>>> Min latency: 0.011647
>>>>>>>
>>>>>>> I tested the single drive via dd if=/dev/zero of=/mnt/hdd2/testfile
>>>>>>> bs=1024k count=20000
>>>>>>> result: 158 MB/sec
>>>>>>>
>>>>>>> Anyone can tell me why such a weak performance? Maybe I missed something?
>>>>>>
>>>>>> Can you run "ceph tell osd \* bench" and report the results? (It'll go
>>>>>> to the "central log" which you can keep an eye on if you run "ceph -w"
>>>>>> in another terminal.)
>>>>>> I think you also didn't create your bench pool correctly; it probably
>>>>>> only has 8 PGs which is not going to perform very well with your disk
>>>>>> count. Try "ceph pool create bench2 120" and run the benchmark against
>>>>>> that pool. The extra number at the end tells it to create 120
>>>>>> placement groups.
>>>>>> -Greg
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