Why do I always get the weirdest bugs? By my calculation, this one has a 0.03% chance of hitting. https://bugzilla.redhat.com/show_bug.cgi?id=1632590 …
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The worst Ceph story I have to share (impact-wise) was just last week, when I did a full (intended to be) hitless reinstall on a production cluster (Ceph+OS upgrade and full OSD reformat into BlueStore) and a VM server was running an old, buggy version of librbd.
I consider it my screwup, because I forgot that I had upgraded one VM cluster recently but the other one was still running year-old software. A quick VM restart fixed it, total downtime was ~15 minutes. Then I hitlessly updated the VM servers using live migration.
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Other services using the cluster weren't impacted at all, which is pretty impressive when you consider I was doing a full rolling disk format and OS reinstall on every OSD in the Ceph cluster.
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But yes, we have backups. We cross-backup between two Ceph clusters (and don't update them at the same time).
End of conversation
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