I’ve just started looking into one of our ceph clusters because a weekly deep scrub had a major IO impact on the cluster which caused multiple VMs to grind to a halt.
So far I’ve discovered that this particular cluster is configured incorrectly for the number of PGS per OSD. Currently that setting is 6 but should be closer to ~4096 based on the calc tool. If I change the number of PGS to the suggested values what should I expect specially around the deep scrub performance but also just in general as I’m very new to ceph. What I’m hoping will happen is that instead of a single weekly deep scrub that runs for 24+ hours we would have lots of smaller deep scrubs that can hopefully finish in a reasonable time with minimal cluster impact. Thanks. _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
