"However it should be possible to complete the do-release-upgrade to the
point of requesting a reboot - don't - drop to the CLI and get all
machines to this point and then:

  restart the mons across all three machines
  restart the mgrs across all three machines
  restart the osds across all three machines"

Yes, I believe this would work.

However, that's not normally how I would do an upgrade.  Normally, I
upgrade one machine, make sure it works, and then upgrade the next.  I
have done it this way since I built the cluster back in Firefly.  When I
did this time, and it destroyed every OSD on the node that I upgraded.

This was very unexpected and disappointing, to say the least.

I wanted to warn others and try to prevent it from happening to them.  I
accept some of the blame.  Part of it is on me, part of it is on Ceph,
part of it is on Ubuntu.

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https://bugs.launchpad.net/bugs/1874939

Title:
  ceph-osd can't connect after upgrade to focal

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