Hi!
This command? ceph tell osd \* bench
Output: tell target 'osd' not a valid entity name
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
I have still no idea.
All the best. Alex
2012/11/4 Gregory Farnum <[email protected]>:
> On Sun, Nov 4, 2012 at 10:58 AM, Aleksey Samarin <[email protected]> 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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