[PVE-User] vzdump snapshot fails with physical disks

[Martin Maurer]

Hi,

Vzdump in snapshot mode uses LVM snapshots, so if you do not have LVM on these disks with enough snapshot space it will fail.

Exclude a disk from backup : (see 'man qm')

Just edit you /etc/qemu-server/VMID.conf file and add the following to the disk definition:  'backup=no"
Br, Martin 

> -----Original Message-----
> From: pve-user-bounces at pve.proxmox.com [mailto:pve-user-
> bounces at pve.proxmox.com] On Behalf Of Rakhesh Sasidharan
> Sent: Mittwoch, 01. Dezember 2010 23:56
> To: pve-user at pve.proxmox.com
> Subject: [PVE-User] vzdump snapshot fails with physical disks
> 
> Hello,
> 
> I have a KVM VM set up to use LVM storage and two physical disks. Here's
> the relevant bits of the config file -
> 
> --8<---
> ide1: /dev/i500_,media=disk
> ide2: /dev/t2000_,media=disk
> virtio0: local-lvm250:vm-102-disk-1
> --8<---
> 
> When I try to do a snapshot backup of this machine, vzdump 1) refuses to do
> a snapshot coz it can't identify the LVM volume group and 2) tries to backup
> the two physical disks.
> 
> --8<---
> # vzdump --snapshot 102
> INFO: starting new backup job: vzdump --snapshot 102
> INFO: Starting Backup of VM 102 (qemu)
> INFO: running
> INFO: status = running
> INFO: mode failure - unable to detect lvm volume group
> INFO: trying 'suspend' mode instead
> INFO: backup mode: suspend
> INFO: ionice priority: 7
> INFO: suspend vm
> INFO: creating archive
> '/var/lib/vz/dump/vzdump-qemu-102-2010_12_02-02_28_13.tar'
> INFO: adding
> '/var/lib/vz/dump/vzdump-qemu-102-2010_12_02-02_28_13.tmp/qemu-
> server.conf'
> to archive ('qemu-server.conf')
> INFO: adding '/dev/i500_' to archive ('vm-disk-ide1.raw') ...
> --8<---
> 
> I have identified the failing of the snapshot down to the two physical disks
> being present. When I remove the physical disks from the config file and
> start the VM, vzdump performs snapshots fine.
> 
> So - is there any way I can make vzdump do a snapshot backup with the two
> physical disks present? And is there any way I can make vzdump ignore these
> physical disks so it doesn't back them up? Upon a hunch I tried vzdump with
> the --exclude-path option (giving it /dev/i500_ as the
> argument) but that didn't help.
> 
> Thanks,
> Rakhesh
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