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https://issues.apache.org/jira/browse/CLOUDSTACK-4774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Suich closed CLOUDSTACK-4774.
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> 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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