Prestarted VMs dissapear from UI after failure to restore snapshot once VM turns from Unknown status to Down

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Virtualization 3.4

Issue

Prestarted VMs dissapear from UI after failure to restore snapshot once VM turns from Unknown status to Down.

Resolution

Upgrade to RHEV 3.4.4 or newer.

Root Cause

If you have a pool VM it's started as stateless.

If the stateless snapshot removal fails and the snapshot content fails to be restored against the template, the VM is completely removed
and engine should attempt to "self-heal" the pool by creating new VM of the same name as the removed one and same settings.

However the self-heal is broken. The VM is correctly deleted, but the replacement is not created due to an issue tracked in the following bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=1149135

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