Chris Suich created CLOUDSTACK-4774:
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Summary: Provide Option to Quiesce VMs While Taking Snapshots
Key: CLOUDSTACK-4774
URL: https://issues.apache.org/jira/browse/CLOUDSTACK-4774
Project: CloudStack
Issue Type: Improvement
Security Level: Public (Anyone can view this level - this is the default.)
Reporter: Chris Suich
CloudStack currently snapshots vm disks by taking hypervisor snapshots.
However, when implementing the storage subsystem API interface takeSnapshot(),
the VM associated with the requested volume is not quiesced since a hypervisor
snapshot is not necessarily taken. When creating a storage level snapshot,
there are ways around this and 'quiescing' the vm without actually quiescing it
(through hypervisor APIs). I would like to propose that there be an option to
quiesce VMs when taking snapshots both manually and through recurring snapshot
policies. One issue I see with this is that this option is not always
applicable. If the default storage provider is used, a hypervisor snapshot will
be taken and therefore the VM will always be quiesced. Some storage providers
may not respect the user's request to quiesce. Because of this, I suggest that
the option be shown to the user as 'Quiesce VM (if applicable)'. This indicates
to the user that the option will be passed to the management server and
respected if possible.
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