Hi,
I'm using Centos5.5 on the host, and the KVM that's available in the
repos. I'm using linux VMs too. My disk images are qcow2 files.
Here's what I want:
To be able to, on the host, create a snapshot of the guest's disk
image, without shutting down the guest, so that I can then restore
back to a point in time for the guest.
I thought I could do this with the qcow2 images.
I've used:
qemu-img snapshot -c snapname disk_image.qcow2
to create the snapshot.
It doesn't work. The snapshots claim to be created, but if I shut
down the guest, apply the snapshot
( qemu-img snapshot -a snapname disk_image.qcow2 )
the guest either:
a.) no longer boots (No bootable disk found)
b.) boots, but is just how it was when I shut it down (it hasn't
reverted back to what it was like when the snapshot was made)
It makes no sense. I can sometimes apply the first snapshot, and it
has worked...but subsequent snapshots are a no go.
One thing that is suspicious is that the VM SIZE and CLOCK are zero:
# qemu-img snapshot -l test1.qcow2
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 with100mb 0 2010-09-28 11:48:23 00:00:00.000
2 with200mb 0 2010-09-28 11:50:53 00:00:00.000
3 with300mb 0 2010-09-28 11:52:49 00:00:00.000
4 whenoff 0 2010-09-28 11:56:41 00:00:00.000
# /usr/libexec/qemu-kvm --help
QEMU PC emulator version 0.9.1 (kvm-83-maint-snapshot-20090205),
Copyright (c) 2003-2008 Fabrice Bellard
I can't find much info about using qcow2 images when I search. Any
help would be appreciated.
Thanks.
Peter
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