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Paused-Critical Disk(s) running out of space. Help please RRS feed

  • Question

  • Be grateful for some advice please.

    I have a virtual machine which has just gone Paused-Critical Disk(s) running out of space on one of it's disks.

    I am trying to work out how to recover. I cannot get into the VM to do anything.

    I have read somewhere else that a solution is to move the VHD to a larger disk. The VHD currently fills the disk it is on.

    What is the best way to do this? I notice that in Hyper-V manager settings for this VM it points to the AVHDX file on the same disk and not the VHD. So how do I change that after I move it?

    I no longer have a Shutdown, Save option, or any other options except Turn Off. Advice there please. I obviously cannot move the VHD while it is running.

    It's Home Server 2011 (Windows server 2008 I think) in the VM and I am using Hyper-V under Windows 8.1.

    Dave

    Sunday, July 20, 2014 9:52 AM

Answers

  • Dave. I would not worry. The one thing that I know is that Hyper-V has a focus to do no harm.

    Since you run a recent version, a clean shutdown should handle it.


    Brian Ehlert
    http://ITProctology.blogspot.com
    Learn. Apply. Repeat.

    Tuesday, July 22, 2014 2:58 AM
    Moderator

All replies

  • Hi Dave,

    turn off the VM, delete any Snapshots on it and wait until they are merged. If this is failing due to disk space, copy the VM folder with its configuration file, the VHD and the avhd-file to another disk and use the import VM dialogue:

    http://virtualizationreview.com/Blogs/Virtual-Insider/2012/07/How-To-Import-VM-Hyper-V-3-Windows-2012.aspx

    Regards,

    Benedict

    Sunday, July 20, 2014 7:40 PM
  • Hi Dave,

    turn off the VM, delete any Snapshots on it and wait until they are merged. If this is failing due to disk space, copy the VM folder with its configuration file, the VHD and the avhd-file to another disk and use the import VM dialogue:

    http://virtualizationreview.com/Blogs/Virtual-Insider/2012/07/How-To-Import-VM-Hyper-V-3-Windows-2012.aspx

    Regards,

    Benedict

    Hi Benedict,

    Thanks for that.

    Ok, you will need to be patient with me here.

    Turn off the VM. Done that.

    Delete snapshots. Are those the AVHDX files? This VM has 3 VHD disks on 3 drives. I notice there are AVHDX files on all 3. I have read somewhere that you should not just simply delete these files. You should do it thru Hyper-V manager. How do you do that? I have read that you can do it in Hyper-V manager with EDIT but that option is not available. It says Edit is not available because checkpoints exist for this virtual machine.

    What do you mean by the VM folder. The disk that has space problems only contains one of the virtual disks. The only files on there are a VHDX file and 2 AVHDX files.

    Configuration file? Is that the XML file, together with a folder of the same name? Those are on a disk without any space problem.

    I cannot move anything at the moment because I haven't enough space. I have just ordered 2 4TB disks to give me more space.

    I should learn a lot by all this. One thing I have already realised is that you need space available for these AVHDX files, which I never new existed. That is probably the root cause of my problem.

    Dave

    Sunday, July 20, 2014 9:50 PM
  • Hi Dave,

    yes, the aVHD files are most likely snapshots.

    Here is a great guide how to remove them: If succesful, this should make your storage problem go away:

    http://blogs.msdn.com/b/virtual_pc_guy/archive/2008/01/16/managing-snapshots-with-hyper-v.aspx

    Regards,

    Benedict

    Sunday, July 20, 2014 9:54 PM
  • The snapshots should be deleted in the Hyper-V Manager.

    Manually deleting the AHVD files will only lose data.

    If there is no snapshot history in the Hyper-V Manager, then the snapshots were most likely deleted already, but the VM not powered off to allow them to merge.

    Check the Hyper-V Event logs for merging errors.


    Brian Ehlert
    http://ITProctology.blogspot.com
    Learn. Apply. Repeat.

    Monday, July 21, 2014 2:52 PM
    Moderator
  • The snapshots should be deleted in the Hyper-V Manager.

    Manually deleting the AHVD files will only lose data.

    If there is no snapshot history in the Hyper-V Manager, then the snapshots were most likely deleted already, but the VM not powered off to allow them to merge.

    Check the Hyper-V Event logs for merging errors.


    Brian Ehlert
    http://ITProctology.blogspot.com
    Learn. Hi Brian,Apply. Repeat.

    Hi Brian,

    I can see no mention of snapshot history in Hyper-V manager. I assume that it is done using the disk Edit option, but, as I point out above, that option is not available.

    I get Edit is not available because checkpoints exist for this virtual machine. How can I clear that?

    I have looked thru the Hyper-V Event logs for merging errors but found none. Do you know which, of the many logs, I should look in?

    Dave

    Monday, July 21, 2014 5:32 PM
  • The edit disk wizard is not involved in managing snapshots / checkpoints.

    If you select the VM in Hyper-V Manager and look at the center pane, you will see if there are any checkpoints.

    The Edit disk wizard has a safety to block you from breaking your VM when AVHDs are involved.

    There area  number of Hyper-V specific event logs under  Applications and Services -> Microsoft -> Windows -> Hyper-V*

    I believe it is the Operations log that has this.


    Brian Ehlert
    http://ITProctology.blogspot.com
    Learn. Apply. Repeat.

    Monday, July 21, 2014 5:39 PM
    Moderator
  • Dave. I would not worry. The one thing that I know is that Hyper-V has a focus to do no harm.

    Since you run a recent version, a clean shutdown should handle it.


    Brian Ehlert
    http://ITProctology.blogspot.com
    Learn. Apply. Repeat.

    Tuesday, July 22, 2014 2:58 AM
    Moderator
  • If there is no snapshot history in the Hyper-V Manager, then the snapshots were most likely deleted already, but the VM not powered off to allow them to merge.


    Well, it's Windows 8.1 as a Host, which does Online-Merging of Snapshots, doesn't it?

    Regards,

    Benedict

    Tuesday, July 22, 2014 5:38 AM
  • Hi Dave,

    " I obviously cannot move the VHD while it is running ."

    Sorry for the late .

    I tested "move " with server2012R2 when the VM is running , it works well .

    In your case , you can choose to move one disk which exhausted disk space to another lager disk with enough disk space .

    Best Regards

    Elton JI


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    Tuesday, July 22, 2014 7:16 AM
    Moderator