I haven't had the urge to dive too deep into this. For me it's not critical, I know that deep-scrubs build up after rebalancing/recovery, I either mute the warning for a couple of days or increase the overall deep-scrub-interval, depending on the agreement with the customer(s). If you have large clusters to scrub, it doesn't really make a difference if it's within a week or a month, really. Potentially, you could have inconsistent PGs discovered a couple of days later, but I've never had any issue with inconsistent PGs, nothing a pg repair hasn't fixed yet. Zitat von "Szabo, Istvan (Agoda)" <Istvan.Szabo@agoda.com>:
scrub during recovery enabled, yesterday recovery finished and still increasing
Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ From: Eugen Block <eblock@nde.ag> Sent: Friday, August 15, 2025 3:45:24 AM To: ceph-users@ceph.io <ceph-users@ceph.io> Subject: [ceph-users] Re: After disk failure not deep scrubbed pgs started to increase (ceph quincy)
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Hi,
by default, scrubs during recovery are disabled, you could enable it if you think your cluster can handle it.
The PG query output you pasted shows that it’s currently backfilling, that’s why it’s building up the (deep-)scrub backlog.
Regards, Eugen
https://docs.ceph.com/en/quincy/rados/configuration/osd-config-ref/#confval-...
Zitat von "Szabo, Istvan (Agoda)" <Istvan.Szabo@agoda.com>:
Hi, After a disk failure, the number of PGs not deep scrubbed started to increase (Ceph Quincy). Here is an example PG: https://gist.githubusercontent.com/Badb0yBadb0y/afe9b26fbae72c79c9430585bf4e... Normally, when this happens, I observe some stuck operations and increased latency on certain OSDs (restarting the affected OSD usually resolves the issue, and the not deep-scrubbed PGs get scrubbed within a day). However, this time I don’t see any obvious problems. Could you please help review the attached not deep-scrubbed PG and let me know if you notice anything unusual? For context, the disk was re-added yesterday and rebalance is still in progress, but the not deep-scrubbed alerts started appearing before the disk was added back. Thank you.
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