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 you:)
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
