We are using DPM 2012 to backup several Server 2008 R2 SP1 Hyper-V hosts with one or more VM guests. On some of these servers DPM is unable to see the child partition snapshot. Originally, the servers experiencing this problem had a local backup configuration using Windows Server backup to a local drive. The host backup saved data to this local drive and the VM backed up to the same drive , just through a network share.
I have a feeling this is related to the problem since the other servers that are fine were setup on DPM straight away but I'm at a loss on how to proceed. I have read the conditions on which Hyper-V online state backup might fail so it might narrow things down a bit but perhaps someone can point em in the right direction?
- Backup (Volume Snapshot) Integration Service is disabled or not installed. (Installed and enabled)
- VM has one or more dynamic disks. (The VM has one dynamically expanding disk, but all the servers do and they are fine)
- VM has one or more non-NTFS based volumes. (All NTFS volumes)
- The VM Cluster Resource Group in a cluster setup is offline. (no cluster configuration)
- VM is not in a running state. (VM is running)
- A ShadowStorage assignment of a volume inside the VM is explicitly set to a different volume other than itself.(not sure how to check this but I think this may be the issue)
Any ideas? Thanks in advance.
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Addition information:
DPm Server: DPM 2012 SP1
Hyper-V Hosts: Server 2008 R2 SP1 - C: & D: Volumes - VHD files stored on D
Hyper-V Guests: Server 2008 R2 SP1 - C: & D: Volumes - C: drive fixed - D: Drive Dynamically Expanding