can´t snapshot volume 'local:114/vm-114-disk-1.raw' ?

[fpausp]

I got this msg when I try to snapshot a win2008r2:

can´t snapshot volume 'local:114/vm-114-disk-1.raw' ?

any suggestions how to resolve ?

 

[udo]

I got this msg when I try to snapshot a win2008r2:

can´t snapshot volume 'local:114/vm-114-disk-1.raw' ?

any suggestions how to resolve ?

Hi,
is your local-storage on an logical-volume? Does this volume-group have enough free space for an lvm-snapshot?
What is the output of

mount
vgs
lvs

Udo

 

[jva1601]

I believe you could only do snapshots if you're using a qcow2 disk.

 

[fpausp]

OK, can I convert the raw to qcow2 ?

 

[jva1601]

Try this link it shows how to convert different image formats.
http://en.wikibooks.org/wiki/QEMU/Images#Converting_image_formats

 

[udo]

I believe you could only do snapshots if you're using a qcow2 disk.

Sorry,
but this is wrong!
If your local storage is on a volume group like on the standard installation you can do snapshot-backups without problems - it's created an lvm-snapshot (need free storage in the volume group).

INFO: Starting Backup of VM 298 (qemu)
INFO: status = running
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO:   Logical volume "vzsnap-proxmox2-0" created
INFO: creating archive '/backup/dump/vzdump-qemu-298-2012_12_07-08_13_40.tar.lzo'
INFO: adding '/backup/dump/vzdump-qemu-298-2012_12_07-08_13_40.tmp/qemu-server.conf' to archive ('qemu-server.conf')
INFO: adding '/mnt/vzsnap0/images/298/vm-298-disk-1.raw' to archive ('vm-disk-ide0.raw')
...

Udo

 

[tom]

KVM live snapshots needs a storage supporting snapshots. qcow2, (and rbd, sheepdog, nexenta, ...). raw do not support KVM live snapshots.

LVM snapshots for backup is a complete different thing (but similar name ...). as long as you raw files are on LVM you can do LVM snapshot for backups.

 

[mmenaz]

Related to storage that support snapshot, digging around I've found that recent LVM support the "lvconvert –merge". As far as I know, has become available since kernel 2.6.33 (and the lvm parts from 2.02.58).
Is something that would work as well as qcow2, once Proxmox will go to a more recent kernel or this feature will be backoporte (maybe by Red Hat?).
Just curious, because I tend to use LVM storage for performance reasons, qcow2 is known to have not stunning I/O performance, and the "snapshot" feature is really valuable when you have to test updates or something like that.