Someone who's got data regarding this should file a bug report, it sounds like a quick fix for defaults if this holds true. On Sat, May 20, 2023, at 00:59, Hector Martin wrote: > 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@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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