Comment 28 for bug 2004555
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| Gorka Eguileor (gorka) wrote Re: [ussuri] Wrong volume attachment - volumes overlapping when connected through iscsi on host | #28 |
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What is the reason why Nova has the policy that deleting the instance should never fail?
I'm talking about the instance record, not the VM itself, because I agree that the VM should always be deleted to free resources.
From my perspective deleting the instance record would result in a very weird user experience and in users manually creating the same situation we are trying to avoid.
- User requests instance deletion
- Calls to disconnect_volume fails
- Nova removes everything it can and at the end even the instance record, while it keeps trying to disconnect the device in the background.
- User wants to use the volume again but sees that it's in-use in Cinder
- Looks for the instance in Nova thinking that something may have gone wrong, but not seeing it there thinks it's a problem between cinder and nova.
- Runs the `cinder delete-attachment` command to return the volume to available state.
We end up in the same situation as we were before, with leftover devices.