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[OpenStack Infra <1841363@xxxxxxxxxxxxxxxxxx>]

This issue was fixed in the openstack/nova rocky-eol  release.

** Changed in: nova/rocky
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1841363

Title:
  nova cannot attach volume whose source_type='block' when setting
  disk_cache_modes as writethrough or writeback

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  In Progress
Status in OpenStack Compute (nova) rocky series:
  Fix Released
Status in OpenStack Compute (nova) stein series:
  Fix Released
Status in OpenStack Compute (nova) train series:
  Fix Released
Status in OpenStack Compute (nova) ussuri series:
  Fix Released

Bug description:
  Wheh nova.conf is set as

  ...

  [libvirt]
  ...
  disk_cachemodes = block=writethrough
  ...

  OR

  [libvirt]
  ...
  disk_cachemodes = block=writeback
  ...

  Nova cannot attache volume whose source_type is 'block', because of a
  libvirt issue: https://bugzilla.redhat.com/show_bug.cgi?id=1086704

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