vzdump problem

[frantek]

Hi,

from time to time I'v a problem with vzdump while doing backups to a USB disk. I get:

Jan 21 08:00:01 bs01 vzdump[374]: INFO: starting new backup job: vzdump --quiet --snapshot --compress --storage backup --maxfiles 1 104
Jan 21 08:00:01 bs01 vzdump[374]: INFO: Starting Backup of VM 104 (qemu)
Jan 21 08:00:02 bs01 vzdump[374]: ERROR: Backup of VM 104 failed - command 'qm set 104 --lock backup' failed with exit code 255
Jan 21 08:00:02 bs01 vzdump[374]: INFO: Backup job finished with errors

When this happens I see the following:

qm list 

      VMID NAME                 STATUS     MEM(MB)    BOOTDISK(GB) PID       
  /dev/dm-8: read failed after 0 of 4096 at 0: Input/output error 
  /dev/dm-8: read failed after 0 of 4096 at 0: Input/output error 
  /dev/dm-8: read failed after 0 of 4096 at 0: Input/output error 
       101 Nagios               stopped    1024              32.00 0         
  /dev/dm-8: read failed after 0 of 4096 at 0: Input/output error 
  /dev/dm-8: read failed after 0 of 4096 at 0: Input/output error 
  /dev/dm-8: read failed after 0 of 4096 at 0: Input/output error 
       102 DLL_Builder          stopped    4096              80.00 0         
  /dev/dm-8: read failed after 0 of 4096 at 0: Input/output error 
  ....
  ....

"lvdisplay" shows:

  --- Logical volume --- 
  ....
  ....
  ....
  LV Name                /dev/vg0/vm-103-disk-1 
  VG Name                vg0 
  LV UUID                m65HoB-dciY-Mo5s-Mmpw-44I1-hXZ1-BywUTe 
  LV Write Access        read/write 
  LV snapshot status     source of 
                         /dev/vg0/vzsnap-bs01-0 [INACTIVE] 
  ....
  ....
  ....
  --- Logical volume --- 
  LV Name                /dev/vg0/vzsnap-bs01-0 
  VG Name                vg0 
  LV UUID                F0rIGg-5PEp-2Uwq-T7wx-oJph-1lBO-XDYxOd 
  LV Write Access        read/write 
  LV snapshot status     INACTIVE destination for /dev/vg0/vm-103-disk-1 
  LV Status              available

To reslove this I've to do:

lvremove -f /dev/vg0/vzsnap-bs01-0 
  /dev/dm-8: read failed after 0 of 4096 at 0: Eingabe-/Ausgabefehler 
  Logical volume "vzsnap-bs01-0" successfully removed

and unlock the VM's.

System:

uname -a
Linux bs01 2.6.35-2-pve #1 SMP Mon Aug 8 07:25:00 CEST 2011 x86_64 GNU/Linux

pveversion -v
pve-manager: 1.9-26 (pve-manager/1.9/6567)
running kernel: 2.6.35-2-pve
proxmox-ve-2.6.35: 1.8-13
pve-kernel-2.6.32-4-pve: 2.6.32-33
pve-kernel-2.6.35-1-pve: 2.6.35-11
pve-kernel-2.6.35-2-pve: 2.6.35-13
qemu-server: 1.1-32
pve-firmware: 1.0-14
libpve-storage-perl: 1.0-19
vncterm: 0.9-2
vzctl: 3.0.29-3pve1
vzdump: 1.2-16
vzprocps: 2.0.11-2
vzquota: 3.0.11-1
pve-qemu-kvm: 0.15.0-1
ksm-control-daemon: 1.0-6

example VM:

name: XP-Lexware
ide2: cdrom,media=cdrom
bootdisk: ide0
ostype: wxp
ide0: vg0:vm-103-disk-1
memory: 3072
sockets: 1
vlan0: rtl8139=B6:F9:18:3F:26:79
onboot: 0
cores: 1

How can I get around this ?

TIA

 

[udo]

Hi,
look which device is dm-8 with

dmsetup ls --tree -o inverted

(the one with an 8 as last number is that device which you search).

Udo

 

[frantek]

I know the devic. dm-8 is - or better was - /dev/vg0/vzsnap-bs01-0

What I need is to know why this happens and how to get rid of this problem ...