I'm managing a Windows Server 2012 R2 2-node cluster that is backed up using a separate DPM 2012 R2 server. All VMs are on Cluster Shared Storage.
I've noticed that some VMs keep hanging in a "Running (Locked)" state (in FOCM, in HVM it shows a "Backing up..." state). Things I noticed while the VMs are in this state are:
- every subsequent DPM backup will fail (it looks like DPM is the cause of this "Locked" state)
- the VM can't be moved to another node
- if the VM is backed up "Online", I can see AVHD files -- the VHD files have the date of the last succesful DPM backup
- if the VM is backed up "Offline", I can't find any snapshots (the VHD files have the date of the last succesful DPM backup, which is weird, since the data in the VM is actually changing)
The only way out of this situation is to shut down the VMs and reboot both cluster nodes. Of course, this isn't something that I like to do on a weekly basis.
My questions:
- What can I do to prevent this "Locked" problem? (the last 2 months I've experienced this problem with 5 different VMs)
- Is there another way to get out of the "Locked" situation? Preferably one that doesn't require a cluster reboot.
- Are there any logs I can check to get more information about this problem?
Thanks in advance!