Ceph snapshot VM "unsupported configuration : internal snapshot for disk vda unsupported for storage type raw"

Community Support
1

I run 3 hosts with Ceph currently in a testing environment.
I’d like to take a snapshot of a VM, but when I do so it fails with the following error in the logs:

Fri Oct 20 19:44:52 2017 [Z0][VMM][D]: Message received: LOG I 76 Command execution fail: ‘if [ -x “/var/tmp/one/vmm/kvm/snapshot_create” ]; then /var/tmp/one/vmm/kvm/snapshot_create one-76 0 76 kvm-02; else exit 42; fi’

Fri Oct 20 19:44:52 2017 [Z0][VMM][D]: Message received: LOG I 76 error: unsupported configuration: internal snapshot for disk vda unsupported for storage type raw

Fri Oct 20 19:44:52 2017 [Z0][VMM][D]: Message received: LOG E 76 Could not create snapshot for domain one-76.

Fri Oct 20 19:44:52 2017 [Z0][VMM][D]: Message received: LOG I 76 ExitCode: 255

Fri Oct 20 19:44:52 2017 [Z0][VMM][D]: Message received: SNAPSHOTCREATE FAILURE 76 Could not create snapshot for domain one-76.

Fri Oct 20 19:44:53 2017 [Z0][InM][D]: Host kvm-03 (3) successfully monitored.

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This is on a CentOS 7 VM built with the App from opennebula.
I confirmed and it’s Qcow2 as well…

Am I doing something wrong?

Versions of the related components and OS (frontend, hypervisors, VMs):

CentOS 7 latest, 5.4.1 across all HV’s.

Steps to reproduce:

Make snapshot of VM.

Current results:

See above for error log.

Expected results:

1 Like
2

If I remember right you can only do that with raw images, there are issues with Ceph and qcow2 images. Try the same using a raw image

3

Hi,

AFAIK on KVM it works with qcow2 files. This line is returned by libvirt:

unsupported configuration: internal snapshot for disk vda unsupported for storage type raw

Best Regards,
Anton Todorov

4

So in combination with Ceph it doesn’t work?

5

AFAIK currently it doesn’t work with any storage that is using raw disks.