edison su created CLOUDSTACK-732:
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Summary: 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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