Hyper-V VMs are pausing due to critical errors - might be snapshot problem??

Posted on 2009-02-09
Last Modified: 2013-11-11
Good morning -

Have a Server 2008 Datacenter ed. Hyper-V server with 10vms running on it.
Plenty of RAM Plenty of CPU..
Imported VHD files over from Virtual Server 2005 R2 into Hyper-V

Vm files along with VHD files are located on iscsi luns mounted inside folders.

For example:


each vm folder points to an iscsi LUN created on a NETAPP SAN.

My typical process for creating a new VM is this:
Create volume on SAN
Create iscsi LUN that points to volume on Hyper-V server
Create new VM pointing all VM files to the iscsi directory.

I had been creating snapshots of all my vms up until recently...
Some of my vms started to pause because of disk space errors
I have since deleted all snapshots.

This weekend i had a vm pause on me...the only way to get it back online again was to copy it's .vhd file to a different folder\iscsi location - then point the paused vm to the new vhd file.
This solved problem.
The only thing is I'm not sure what the issue was...
There was plenty of space on the volume and virtual disk.
I'm looking at the logs this morning and I'm finding these errors:

Log Name:      Microsoft-Windows-Hyper-V-VMMS-Admin
Source:        Microsoft-Windows-Hyper-V-VMMS
Date:          2/9/2009 10:55:08 AM
Event ID:      14250
Task Category: None
Level:         Warning
User:          SYSTEM
Cannot find the specified snapshot. (Snapshot ID A801476B-9119-4231-B0FE-2C7E2AF2CCCE)

and this one

Log Name:      System
Source:        vhdparser
Date:          2/7/2009 6:29:39 PM
Event ID:      1
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
The parent virtual hard disk appears to have been modified without using the differencing virtual hard disk located at "...\\3AFC8912-960A-4C53-93E9-48282EB1F05C\vm10_C77E54CC-01FC-4CBE-8E84-715B69322DFE.avhd".  Modifying the parent virtual hard disk may result in data corruption.  It is strongly recommended that you lock the parent virtual hard disk to prevent this in the future.  If you recently changed time zones on your computer, you can safely continue using this virtual hard disk.

Any ideas?
Are there any known issues with importing vhd files from VS 2005?


Question by:javajo
    LVL 38

    Expert Comment

    by:Philip Elder
    Prior to importing, did you uninstall the VS2005 Virtual Additions (been a while for VS2005 so can't remember if that is the exact name)?

    In your VM manager, do you see references to the old snapshots that are now gone?


    Accepted Solution

    Thanks MPECSInc.
    yes - uninstalled vm additions prior.  when u say references what do you mean...i don't see any snapshots in the mmc snapshots window...

    Author Comment

    i just realized something...

    Being a newbie to Hyper V i forgot to create an internal network so my VMs can talk to my Host machine...I'm also getting alot of w32 time errors.
    Could this be my problem?

    Author Comment

    scratch that - i have an external network and that should be all i need...
    LVL 38

    Expert Comment

    by:Philip Elder
    Depending on the role that the VMs have, it is a good idea to uncheck the Time Synchronization under the Integration Services section for your VM.

    Be default, we disable this feature for any domain joined VM since the VM will be receiving its time updates from the DCs on the domain.


    Author Comment

    thank u all for your help.

    The issue was that the LUNS were not big enough to hold all the VM info...

    Couldn't see the forest through through the trees...

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