[Bug 1979214] Re: pacific -> quincy upgrade - rados-classes loading broken

[James Page]

Struggling to reproduce this on a new deployment - tested new and
upgrade paths

focal + quincy: OK
focal + pacific -> quincy: OK
focal + octopus -> pacific -> quincy: OK

I might not be going far enough back in time - the deployment that
reported this issue was been in service for some time and started off as
a bionic deployment.

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https://bugs.launchpad.net/bugs/1979214

Title:
  pacific -> quincy upgrade - rados-classes loading broken

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive yoga series:
  New
Status in ceph package in Ubuntu:
  New

Bug description:
  Ubuntu 20.04
  UCA Xena -> Yoga upgrade

  Deployment was functional before upgrade; post upgrade a number of
  issues occured:

  a) the devicehealth mgr module failed to startup with a device I/O error
  b) the radosgw instances in the deployment failed to startup with and error about not being able to load the bucket list

  The ceph-osd processes where reporting:

  ceph-osd.9.log:2022-06-20T13:44:36.201+0000 7f0ad9feb700  0
  _load_class could not stat class lib/x86_64-linux-gnu/rados-
  classes/libcls_rbd.so: (2) No such file or directory

  for various libcls_*.so files despite the fact that then where
  installed albeit under /usr/lib...

  A new deployment using Yoga/Quincy does not exhibit this symptom.

  Setting

    osd class dir = /usr/lib/x86_64-linux-gnu/rados-classes

  worked around this issue in the deployment.

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