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Hi, everyone. Recently, we did some stress test on ceph using three machines. We tested the IOPS of the whole small cluster when there are 1~8 OSDs per machines separately and the result is as follows: OSD num per machine fio iops
1
10k
2
16.5k
3
22k
4
23.5k
5
26k
6
27k
7
27k
8
28k As shown above, it seems that there is some kind of bottleneck when there are more than 4 OSDs per machine. Meanwhile, we observed that the CPU %idle during the test, shown below, has also some kind of correlation with
the number of OSDs per machine. OSD num per machine CPU idle
1
74%
2
52%
3
30%
4
25%
5
24%
6
17%
7
14%
8
11% It seems that with the number of OSDs per machine increasing, the CPU idle time is reducing and the reduce rate Is also decreasing, can we come to the conclusion that CPU is the performance bottleneck in this test? Thank youJ |
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