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https://issues.apache.org/jira/browse/CLOUDSTACK-732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573646#comment-13573646
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Marcus Sorensen commented on CLOUDSTACK-732:
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Speaking of this, will the storage refactor support both volume
snapshot and vm snapshot? Since the storage controller will be doing
the snapshotting, perhaps independent of libvirt, it seems like we
should support "snapshot this disk", as well as "pause the VM and
snapshot all of it's disks". Many storage appliances would do this
very quickly.
> Add back KVM snapshot support
> -----------------------------
>
> Key: CLOUDSTACK-732
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-732
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: KVM
> Affects Versions: 4.0.0
> Environment: RHEL 6.3
> Reporter: edison su
> Assignee: Fang Wang
> Priority: Critical
> Fix For: 4.2.0
>
>
> In the latest KVM(on both RHEL 6.3 and Ubuntu 12.04), it supports external
> snapshot. We need to investigate the status of external snapshot, as far as I
> know, it still doesn't support disk-only snapshot(taking snapshot will pause
> VM for a long time, e.g. few minutes).
> 1. testing external snapshot: take an external snapshot instead of default
> qcow2 internal snapshot, then back it up into backup storage. Only need to
> test with libvirt snapshot API, if it works, then works, no need to hack on
> the qemu-kvm.
> 2. test how long it will pause a VM during taking snapshot. from link [2] and
> [3], only qemu-kvm-rhev supports disk-only snapshot, not sure ubuntu 12.04
> supports it or not. We need to investigate on the issue.
> If item 1 and item 2(disk-only snapshot) works, then we can support default
> kvm qcow2 snapshot again.
> The link:
> [1]
> http://kashyapc.wordpress.com/2011/10/04/snapshotting-with-libvirt-for-qcow2-images/
> [2]
> http://www.linux-kvm.com/content/first-look-virtual-machine-online-disk-snapshots-coming-fedora-18
> [3] http://www.redhat.com/archives/libvir-list/2012-July/msg00782.html
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