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Virtual Machine hosted on HYPER-V shows status "saving" and restarts at times.

I just inherited HYPER-V host that has only 1 Virtual Machine on it.

The Host's OS is Windows 2008 R2.
The VM's OS is Server 2012 R2.

It seems that the VM is at times becoming "unavailable" and when I check the "Hyper-V Manager" it shows "saving" status.
It happened few times now - at first I thought that I must have initiated the "Saving" by mistake, but now I was able to observe it while it happened.

I do not know how often if happens, but it seems to be happening in "after business hours" time frame - It happened today around 7PM - I will try to observe if it will happen again at the same time.

The VM went into "saving" status and eventually "restored" itself.
I have not seen this behaviour on other HYPER-V hosts, and I wonder if the previous IT stuff had set-up some kind of scheduled task, possibly for backup purposes as they did not have proper backup software before.

I can't find any traces of the scheduled task, and wonder if someone can give me some pointers?
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pyotrek
Asked:
pyotrek
2 Solutions
 
VB ITSSpecialist ConsultantCommented:
Check the programs installed on the Hyper-V Host to see if there's any sort of backup agent installed on it. It may also be worth checking the disk space on the drive where the VHD files for the VM are stored as low disk space can cause VMs to go into a saved state.
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pyotrekAuthor Commented:
Thanks for the comment

There is plenty of disk space, and no backup agent of any sort.
It is pretty bare machine, with just clean OS on it.
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JoeteckCommented:
Check for a virus or Trojan on either machine..
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VB ITSSpecialist ConsultantCommented:
Any chance you can list all the installed programs on the host just to confirm?

What about any backup software/agent that's installed on the 2012 R2 VM itself?
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Windows Server Backup being used to back up the host?

Integration Services in the newer OS would not be happy with the VSS calls of an older OS as host.

Any snapshots?
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pyotrekAuthor Commented:
Philip Elder and VB ITS:

I had installed Altaro Hyper-V backup on the host, and it runs backups at 7:00PM.
Since I never had issue in this regards with ALTARO - I assumed that it must be something else that triggers the "saving" mode on VM.

I think the key is the older OS on the HV Host and newer OS on the VM - but the trigger is the Altaro Backup.

I am supporting multiple environments with Hyper-V Server 2012 R2 Core as the host OS and never had issues with Altaro.
In case of this particular environment - I am in process of getting new hardware that will run  Hyper-V Server 2012 R2 Core as the host OS, and will migrate the VM to it.
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