Did this already. It doesn't change the number of objects in flight. Best regards, ================= Frank Schilder AIT Risø Campus Bygning 109, rum S14 ________________________________________ From: 胡 玮文 <huww98@xxxxxxxxxxx> Sent: 03 December 2020 12:35:03 To: Frank Schilder Cc: ceph-users@xxxxxxx Subject: Re: Increase number of objects in flight during recovery Hi, There is a “OSD recovery priority” dialog box in web dashboard. Configurations it will change includes: osd_max_backfill osd_recovery_max_active osd_recovery_max_single_start osd_recovery_sleep Tune these config may helps. “High” priority corresponding to 4, 4, 4, 0, respectively. Some of these also have a _ssd/_hdd variant. > 在 2020年12月3日，17:11，Frank Schilder <frans@xxxxxx> 写道： > > Hi all, > > I have the opposite problem as discussed in "slow down keys/s in recovery". I need to increase the number of objects in flight during rebalance. It is already all remapped PGs in state backfilling, but it looks like no more than 8 objects/sec are transferred per PG at a time. The pools sits on high-performance SSDs and could easily handle a transfer of 100 or more objects/sec simultaneously. Is there any way to increase the number of transfers/sec or simultaneous transfers? Increasing the options osd_max_backfills and osd_recovery_max_active has no effect. > > Background: The pool in question (con-fs2-meta2) is the default data pool of a ceph fs, which stores exclusively the kind of meta data that goes into this pool. Storage consumption is reported as 0, but the number of objects is huge: > > NAME ID USED %USED MAX AVAIL OBJECTS > con-fs2-meta1 12 216 MiB 0.02 933 GiB 13311115 > con-fs2-meta2 13 0 B 0 933 GiB 118389897 > con-fs2-data 14 698 TiB 72.15 270 TiB 286826739 > > Unfortunately, there were no recommendations on dimensioning PG numbers for this pool, so I used the same for con-fs2-meta1, and con-fs2-meta2. In hindsight, this was potentially a bad idea, the meta2 pool should have a much higher PG count or a much more aggressive recovery policy. > > I now need to rebalance PGs on meta2 and it is going way too slow compared with the performance of the SSDs it is located on. In a way, I would like to keep the PG count where it is, but increase the recovery rate for this pool by a factor of 10. Please let me know what options I have. > > Best regards, > ================= > Frank Schilder > AIT Risø Campus > Bygning 109, rum S14 > _______________________________________________ > 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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