Hyper-V virtual machine recovery checkpoint problems

2

One of my virtual machines, backed up by DPM, is repeatedly creating recovery checkpoints and exponentially increasing the storage space required on the host.

Three servers involved:

  • Server 2012 R2, Hyper-V host [HOST/ASH-LIBRARY]
  • Server 2008 R2, virtual machine [VM/ASH-PRINTERS] run on HOST
  • Server 2012 R2, physical machine [DPM/AHSSCCM01], running SCCM 2012 R2 with DPM R2 4.2

HOST is backed up by DPM, and VM is part of that:

DPM backing up VM

VM is creating Backup checkpoints every day... and not getting rid of any of them when they're no longer needed:

VM snapshots

From the reading I've done online, this may be because one of the earlier checkpoints failed to create properly - and now it can't be removed, so DPM keeps adding to the tree and being unable to remove any of them.

I'm looking for a way to remove these checkpoints and free up space on HOST's hard drive. Obviously I could just delete the files, but that won't stop the on-going problem.

I have tried the following:

  • Disk merge, latest AVHD to parent VHD, no change
  • Deleting the Checkpoint subtree, "Cannot delete a checkpoint subtree containing a recovery checkpoint"
  • Exporting the latest checkpoint to then try and mount a new VM from it, "Cannot merge automatic VHD chain"
  • Running the command Get-VMSnapshot -VMName ASH-Printers | Remove-VMSnapshot, results in Error 0x80070002: The system cannot find the file specified (which may be because HOST's hard drive only has 6Gb space remaining ... but I have no room to manoeuvre the VMs to test this)

What else can I try to fix this problem?

virtual-machines
hyper-v
scdpm
asked on Server Fault Oct 25, 2017 by dunc • edited Oct 25, 2017 by dunc

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