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https://issues.apache.org/jira/browse/CLOUDSTACK-732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561256#comment-13561256
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Fang Wang commented on CLOUDSTACK-732:
--------------------------------------
Internal snapshot works, bot not the external snapshot with --disk-only option.
1. Internal snapshot:
virsh # snapshot-list i-2-16-VM
Name Creation Time State
------------------------------------------------------------
virsh # snapshot-create i-2-16-VM
Domain snapshot 1358984012 created
virsh # snapshot-list i-2-16-VM
Name Creation Time State
------------------------------------------------------------
1358984012 2013-01-23 18:33:32 -0500 running
2. External snapshot create fails:
virsh # snapshot-create i-2-16-VM --disk-only
error: operation failed: Failed to take snapshot: unknown command:
'snapshot_blkdev'
> 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: 4.1.0
>
>
> 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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