[PVE-User] vzdump snapshot fails with physical disks

[Rakhesh Sasidharan]

On Thu, 02 Dec 2010 09:23 +0000, "Martin Maurer" <martin at proxmox.com>
wrote:
> 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"

Nice! :) Thanks for pointing that out. I hadn't really gone through the
disk options in the qm man page. 

Could also you tell me what the [snapshot=on|off] and
[cache=none|writethrough|writeback] and [format=f] options do?

Thanks,
Rakhesh

> 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
> > _______________________________________________
> > pve-user mailing list
> > pve-user at pve.proxmox.com
> > http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
> 
> 
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