Hi, cephers
I'm doing the performance test of ceph when recovering. The scene is simple:
1. run fio on 6 krbd device
2. stop one OSD for 10 seconds
3. start that OSD
However, when the OSD up and start recovering, the performance of fio
drop down from 9k to 1k for about 20 seconds. At the same tiime, we
found the SSD of that OSD's latency is more than 100ms, so it seems
the SSD become the bottleneck。
So we want to slow down the recovery speed to lighten the load of the
SSD when recovery. But configuration like:
osd_recovery_max_active
osd_recovery_max_chunk
osd_max_backfills
osd_recovery_op_priority
are all useless.
After reading and change some code, we want add a flow control in the
process of:
OSD::do_recovery
So, will it be possible to do so and if this solution has some
potential problem?
Thanks!
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