Simultaneous operations on instances sharing multi-attach volume fail with "Invalid volume error"
Issue
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Heat stack creation fails with multiple instances sharing a single multi-attach volume.
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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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