Can really nobody help?
Am 25.05.2012 17:47, schrieb Alexandre DERUMIER:
Hi Stephan,
Do you have same performance with read ?
Read is fine for both versions see here:
3.0.30
Write:
Total time run: 30.872357
Total writes made: 1095
Write size: 4194304
Bandwidth (MB/sec): 141.874
Average Latency: 0.450187
Max latency: 2.00672
Min latency: 0.091783
Read:
Total time run: 22.907021
Total reads made: 1095
Read size: 4194304
Bandwidth (MB/sec): 191.208
Average Latency: 0.333954
Max latency: 1.71987
Min latency: 0.041373
3.4.0
Write:
Total time run: 124.573247
Total writes made: 647
Write size: 4194304
Bandwidth (MB/sec): 20.775
Average Latency: 3.08058
Max latency: 65.2522
Min latency: 0.089587
Read:
Total time run: 13.191562
Total reads made: 647
Read size: 4194304
Bandwidth (MB/sec): 196.186
Average Latency: 0.322895
Max latency: 1.22392
Min latency: 0.043784
Did you have done some iostats ?
Yes - I/O is heavily jumping between 0 and 60MB/s but of the time it's 0
or around 10MB/s.
how much time to flush from journal to disks ?
I don't know how to measure this. As ceph starts to write to journal and
disk in parallel and tmpfs isn't even shown in iostat.
Greets,
Stefan
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