NetVault Server: 9.0.1 Linux SuSE 11.0
NetVault Client: 9.0.1 Windows 2008
Hyper-V Plugin: 1.7
Hyper-V Server: Win2008 and Cluster
Even rebooting the problem VM, the following error messages still occured:
1] Information 2014/01/14 07:35:44 0 Data Plugin SRV-HV1 Volume Shadow Copy Service system writers available for use have been obtained
With sub text:
Task Scheduler Writer
VSS Metadata Store Writer
Performance Counters Writer
Microsoft Hyper-V VSS Writer
System Writer
ASR Writer
Shadow Copy Optimization Writer
Registry Writer
COM+ REGDB Writer
Cluster Database
BITS Writer
WMI Writer
2] Error 2014/01/14 07:38:17 156 Data Plugin SRV-HV1 POWERSHELL ERROR: ERROR: Merging is pending for the VM: SRV-BDD, Please complete merging. Failing the backup as we cannot restore it later.
3] Error 2014/01/14 07:38:17 156 Data Plugin SRV-HV1 Error fetching file list for image level backup for VM: SRV-BDD
4] Error 2014/01/14 07:38:35 156 Data Plugin SRV-HV1 Failed to backup VM SRV-BDD
5] Error 2014/01/14 07:38:35 156 Jobs netvault_srv Job Status: Backup Failed
In Microsoft Hyper-V, snapshots are merged with disks when the machine is shut down. This means that if a snapshot has been taken and deleted, it will not be merged until the virtual machine is off for a long enough period of time to merge the files. We unfortunately don't know how long this period is, as can vary.
It's also worth noting that the merge requires a bit of disk space and this can vary quite drastically, so we can’t specify how much disk space is needed either. If there is not enough room you should receive an error code 0x80070070 for example.
The reason we give this “Error fetching file list for image level backup for VM” error is that if we backup VMs in this state, they are not recoverable. We would much rather fail the backup and allow something to be done about it now, rather than fail a restore further down the line.
So in this case, the problem VM wasn’t off for long enough for the merge to happen.
Further information is on the following Microsoft link:
https://social.technet.microsoft.com/wiki/contents/articles/670.hyper-v-concepts-snapshots.aspx
