Backup VM with 2 disks or more

Nov 20, 2012

May be, it stupid question.

Help me, I want to understand.
How does vzdump make backup of vm with more than 1 disk?
I use shared LVM storage.

1. create snapshot disks
2. backup
3. delete snapshot

1. create snapshot disk 1
2. backup disk 1
3. create snapshot disk 2
4. backup disk 2
5. ...

if variant2 is "true". What about consistensy?

I made test.

I created vm:
agent: 1
boot: cdn
bootdisk: scsi0
cores: 2
cpu: Westmere,flags=+pcid
ide2: none,media=cdrom
memory: 4096
name: testfe-bkp
net0: virtio=C6:73:7F:8F:AD:4E,bridge=vmbr0,tag=261
numa: 0
ostype: l26
scsi0: vm_shared7:vm-576-disk-0,cache=writethrough,size=50G
scsi1: vm_shared7:vm-576-disk-1,cache=writethrough,size=32G
scsihw: virtio-scsi-single
smbios1: uuid=b4657518-12eb-4c36-a4f1-0a1c0adb332b
sockets: 1

I started backup and then created 2 files.
test-bpk:~ # touch /disk1/backup.txt /disk2/backup.txt
test-bkp:~ # ll /disk1/backup.txt /disk2/backup.txt
-rw-r----- 1 root root 0 Jun 26 09:32 /disk1/backup.txt
-rw-r----- 1 root root 0 Jun 26 09:32 /disk2/backup.txt

Backup log:
INFO: starting new backup job: vzdump 576 --remove 0 --node che-pve4-09 --mode snapshot --storage backup-nas03 --compress lzo
INFO: Starting Backup of VM 576 (qemu)
INFO: Backup started at 2019-06-26 09:32:38
INFO: status = running
INFO: update VM 576: -lock backup
INFO: VM Name: test-bkp
INFO: include disk 'scsi0' 'vm_shared7:vm-576-disk-0' 50G
INFO: include disk 'scsi1' 'vm_shared7:vm-576-disk-1' 32G
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating archive '/mnt/pve/backup-nas03/dump/vzdump-qemu-576-2019_06_26-09_32_38.vma.lzo'
Qemu Guest Agent is not running - VM 576 qmp command 'guest-ping' failed - got timeout
INFO: started backup task 'd870cb09-30ad-49f5-8faf-6fdd22aa865b'
INFO: status: 0% (315490304/88046829568), sparse 0% (96714752), duration 3, read/write 105/72 MB/s
INFO: status: 1% (938606592/88046829568), sparse 0% (103837696), duration 8, read/write 124/123 MB/s
INFO: status: 100% (88046829568/88046829568), sparse 51% (45114052608), duration 692, read/write 84/63 MB/s
INFO: transferred 88046 MB in 692 seconds (127 MB/s)
INFO: archive file size: 20.92GB
INFO: Finished Backup of VM 576 (00:11:39)
INFO: Backup finished at 2019-06-26 09:44:17
INFO: Backup job finished successfully

I restored VM from backup and I have file on second disk

test-bkp:~ # ll /disk1/backup.txt /disk2/backup.txt
ls: cannot access '/disk1/backup.txt': No such file or directory
-rw-r----- 1 root root 0 Jun 26 09:32 /disk2/backup.txt

It strange for me.
I expected no files on both disks.

Where did I mistake?
Last edited:


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