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From "edison su (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-732) Add back KVM snapshot support
Date Tue, 05 Feb 2013 22:55:13 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571838#comment-13571838
] 

edison su commented on CLOUDSTACK-732:
--------------------------------------

external snapshot doesn't work on RHEL 6.3, so we can't add snapshot feature back into 4.1
without patching qemu-kvm. Let's move the feature to 4.2.
                
> 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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