Hello Ceph-Users after upgrading one of our clusters to Nautilus we noticed the x pgs not scrubbed/deep-scrubbed in time warnings. Through some digging we found out that it seems like the scrubbing takes place at random and doesn't take the age of the last scrub/deep-scrub into consideration. I dumped the time of the last scrub with a 90 min gap in between: ceph pg dump | grep active | awk '{print $22}' | sort | uniq -c dumped all 2434 2020-08-30 5935 2020-08-31 1782 2020-09-01 2 2020-09-02 2 2020-09-03 5 2020-09-06 3 2020-09-08 5 2020-09-09 17 2020-09-10 259 2020-09-12 26672 2020-09-13 12036 2020-09-14 dumped all 2434 2020-08-30 5933 2020-08-31 1782 2020-09-01 2 2020-09-02 2 2020-09-03 5 2020-09-06 3 2020-09-08 5 2020-09-09 17 2020-09-10 51 2020-09-12 24862 2020-09-13 14056 2020-09-14 It is pretty obvious that the PGs that have been scrubbed a day ago have been scrubbed again for some reason while ones that are 2 weeks old are basically left untouched. One way we are currently dealing with this issue is setting the osd_scrub_min_interval to 72h to force the cluster to scrub the older PGs. This can't be intentional. Has anyone else seen this behavior? Kind regards Johannes