On 17/05/2023 03.07, 胡 玮文 wrote: > Hi Sake, > > We are experiencing the same. I set “osd_mclock_cost_per_byte_usec_hdd” to > 0.1 (default is 2.6) and get about 15 times backfill speed, without > significant affect client IO. This parameter seems calculated wrongly, from > the description 5e-3 should be a reasonable value for HDD (corresponding to > 200MB/s). I noticed this default is originally 5.2, then changed to 2.6 to > increase the recovery speed. So I suspect the original author just convert > the unit wrongly, he may want 5.2e-3 but wrote 5.2 in code. > > But all this may be not important in the next version. I see the relevant > code is rewritten, and this parameter is now removed. > > high_recovery_ops profile works very poorly for us. It increase the average > latency of client IO from 50ms to about 1s. > > Weiwen Hu >
Thank you for this, that parameter indeed seems completely wrong (assuming it means what it says on the tin). After changing that my Quincy cluster is no recovering at a much more reasonable speed. - Hector _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
