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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Honestly, that PM is mostly a story of a bunch of admin errors plus one or two Ceph bugs. No data was lost. I'm not going to criticize the admins since they're unpaid volunteers and we all learn from mistakes, but I'm having a much better time running my Ceph clusters.
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.
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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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