Btw, my ceph version is 0.80.11 2015-12-07 21:45 GMT+08:00 Libin Wu <hzwulibin@xxxxxxxxx>: > 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! _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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