Hi,

I guess you are hitting the same bug I have reported here:

https://lists.ovirt.org/archives/list/users@ovirt.org/message/AMVU2RS5RHY4OPUFRDEU4F3OEWKDUZXB/ 

In fact I am hitting it when testing some infrastructure backup solutions (not only yours) for our oVirt environments...
I have no solution yet and the recommendation is to test with libvirt 6, but don't think it can apply for oVirt 4.4...

Regards,
Marco

On Tue, 2 Jun 2020 at 04:50, <minnie.du@vinchin.com> wrote:
Hello,

We have met a problem when testing oVirt 4.4.

Our VM is on NFS storage. When testing the snapshot function of oVirt 4.4, we created snapshot 1 and then snapshot 2, but after clicking the delete button of snapshot 1, snapshot 1 failed to be deleted and the state of corresponding disk became illegal. Removing the snapshot in this state requires a lot of risky work in the background, leading to the inability to free up snapshot space. Long-term backups will cause the target VM to create a large number of unrecoverable snapshots, thus taking up a large amount of production storage. So we need your help.
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