I'm not sure about the effect of osd_mclock_override_recovery_settings over osd_recovery_max_active, at least the documentation doesn't mention any links between the two. One would have to go through the code to check this.
Generally speaking, I would advise using either mClock with profiles or WPQ with historical options. Mixing the two makes things more unpredictable. Regards, Frédéric. ----- Le 31 Jan 25, à 9:51, Jaemin Joo <[email protected]> a écrit : > Thank you for your response quickly. > My cluster version is 18.2.1 and the OSD's scheduler is mClick. > I set osd_mclock_override_recovery_settings to true when I was changing > osd_max_backfills & osd_recovery_max_active. > Do I set osd_mclock_override_recovery_settings to true when I change > osd_recovery_max_single_start? > Could you explain more what osd_recovery_max_single_start is? I wonder whether > it affects the number of "backfills_in_flight" & "recovering" in pg query. > 2025년 1월 31일 (금) 오후 5:05, Frédéric Nass < [ > mailto:[email protected] | [email protected] ] >님이 > 작성: >> Hi, >> What version of Ceph is this? Which scheduler is in use? mClock or WPQ? >> $ ceph config show osd.0 osd_op_queue >> If the OSD's scheduler is mClock then unless you set >> osd_mclock_override_recovery_settings to true (not recommended), changing >> osd_max_backfills and osd_recovery_max_active will have no impact. >> mClock requires using profiles. Read this [1]. >> Regards, >> Frédéric. >> [1] [ >> https://docs.ceph.com/en/reef/rados/configuration/mclock-config-ref/?#recovery-backfill-options >> | >> https://docs.ceph.com/en/reef/rados/configuration/mclock-config-ref/?#recovery-backfill-options >> ] >> ----- Le 31 Jan 25, à 8:25, Jaemin Joo [ mailto:[email protected] | >> [email protected] ] a écrit : >> > Hi, all >> > I am suffering from slow backfilling and recovering. >> > I increased to "max_backfills" = 64, "recovery_max_actives" = 64. I know >> > it's unnessary to increase more in my ceph cluster. >> > When I checked pg query, I found the number of >> > "backfills_in_flight"&"recovering" is 4. >> > I set "osd_recovery_max_single_start = 4" so I think >> > "osd_recovery_max_single_start" affects to the number of >> > "backfills_in_flight"&"recovering". >> > I increased to "osd_recovery_max_single_start = 16" but the number of >> > "backfills_in_flight"&"recovering" in pg query was not changed. >> > I know "osd_recovery_max_single_start" runtime is true. >> > Should I restart the osds to increase the number of >> > "backfills_in_flight"&"recovering"? or Is there the other way? >> > _______________________________________________ >> > ceph-users mailing list -- [ mailto:[email protected] | >> > [email protected] ] >>> To unsubscribe send an email to [ mailto:[email protected] | >> > [email protected] ] _______________________________________________ ceph-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
