Simultaneous operations on instances sharing multi-attach volume fail with "Invalid volume error"

Solution Verified - Updated -

Issue

  • Heat stack creation fails with multiple instances sharing a single multi-attach volume.

  • Some of the instances become ERROR status after performing openstack server resize on multiple instances sharing a single multi-attach volume at once.

Environment

  • Red Hat OpenStack Platform 16.2
  • Red Hat OpenStack Platform 17.1
  • Cinder storage backend with multi-attach capability
  • Multiple instances sharing a single multi-attach volume

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