Snapshot OK, but Blockcommit has issues

[htpcguru]

I am able to create a snapshot of a running VM.

root@OttSwServer1:/mnt/user/domains/Ubuntu-OttSwVM01# virsh snapshot-create-as --domain "Ubuntu-OttSwVM01" --quiesce --name backup --atomic --disk-only
Domain snapshot backup created
root@OttSwServer1:/mnt/user/domains/Ubuntu-OttSwVM01# ls
vdisk1.backup  vdisk1.qcow2
root@OttSwServer1:/mnt/user/domains/Ubuntu-OttSwVM01# virsh snapshot-list Ubuntu-OttSwVM01
Name                 Creation Time             State
------------------------------------------------------------
 backup               2018-04-10 08:18:15 -0700 disk-snapshot

 

However, when I tried to do blockcommit of the snapshot, it complains about the vdisk location.

root@OttSwServer1:/mnt/user/domains/Ubuntu-OttSwVM01# virsh blockcommit Ubuntu-OttSwVM01 /mnt/user/domains/Ubuntu-OttSwVM01/vdisk1.backup --active --verbose --pivot
error: internal error: qemu block name '/mnt/disk1/domains/Ubuntu-OttSwVM01/vdisk1.qcow2' doesn't match expected '/mnt/user/domains/Ubuntu-OttSwVM01/vdisk1.qcow2'

 

Looks like blockcommit command looks for the vdisk from actual disk location rather than user share mount. (vdisk1.qcow2 file physical location is on /mnt/disk1)

 

The snapshot xml does have the correct base image path on the user share "/mnt/user"

root@OttSwServer1:/mnt/user/domains/Ubuntu-OttSwVM01# virsh snapshot-dumpxml Ubuntu-OttSwVM01 backup | grep disk1
      <source file='/mnt/user/domains/Ubuntu-OttSwVM01/vdisk1.backup'/>
        <source file='/mnt/user/domains/Ubuntu-OttSwVM01/vdisk1.qcow2'/>

vdisk files references also look good:

root@OttSwServer1:/mnt/user/domains/Ubuntu-OttSwVM01# virsh domblklist Ubuntu-OttSwVM01
Target     Source
------------------------------------------------
hdc        /mnt/user/domains/Ubuntu-OttSwVM01/vdisk1.backup
hda        /mnt/user/isos/ubuntu-16.04.3-desktop-amd64.iso

 

Thoughts?

Edited April 10, 2018 by htpcguru

[htpcguru]

If I specify the vdisk.qcow2 location on KVM/Qemu in /mnt/disk1/... rather than /mnt/user/..., the operations work as expected

root@OttSwServer1:~# virsh domblklist Ubuntu-OttSwVM01
Target     Source
------------------------------------------------
hdc        /mnt/disk1/domains/Ubuntu-OttSwVM01/vdisk1.qcow2
hda        /mnt/user/isos/ubuntu-16.04.3-desktop-amd64.iso

root@OttSwServer1:~# virsh snapshot-list Ubuntu-OttSwVM01
 Name                 Creation Time             State
------------------------------------------------------------

root@OttSwServer1:~# virsh snapshot-create-as --domain "Ubuntu-OttSwVM01" --quiesce --name backup --atomic --disk-onlyDomain snapshot backup created
root@OttSwServer1:~# virsh domblklist Ubuntu-OttSwVM01
Target     Source
------------------------------------------------
hdc        /mnt/disk1/domains/Ubuntu-OttSwVM01/vdisk1.backup
hda        /mnt/user/isos/ubuntu-16.04.3-desktop-amd64.iso

root@OttSwServer1:~# virsh snapshot-list Ubuntu-OttSwVM01
 Name                 Creation Time             State
------------------------------------------------------------
 backup               2018-04-10 08:46:49 -0700 disk-snapshot

root@OttSwServer1:~# virsh blockcommit Ubuntu-OttSwVM01 /mnt/disk1/domains/Ubuntu-OttSwVM01/vdisk1.backup --active --verbose --pivot
Block commit: [100 %]
Successfully pivoted
root@OttSwServer1:~# virsh domblklist Ubuntu-OttSwVM01Target     Source
------------------------------------------------
hdc        /mnt/disk1/domains/Ubuntu-OttSwVM01/vdisk1.qcow2
hda        /mnt/user/isos/ubuntu-16.04.3-desktop-amd64.iso

root@OttSwServer1:~# virsh snapshot-list Ubuntu-OttSwVM01 Name                 Creation Time             State
------------------------------------------------------------
 backup               2018-04-10 08:46:49 -0700 disk-snapshot

root@OttSwServer1:~#

Looks like a bug in blockcommit?