Hyper-V - Unable to edit virtual disk

I am looking for some assistance with my two Hyper-Vs please .

I have a 2 Hyper-v hosts, running Windows 2008 R2.  HV-01 has 4 VM’s and HV-02 has 5 VM’s.

I needed to extend a drive on a guest on HV-01, I shut the guest server down,  then on Hyper-V manager I went to: settings > hard drive > edit
I then get an error stating: Unable to edit virtual disk (Screen grab attached).

Unable to edit virtual disk
If I select the option to inspect, I get: An error occurred attempting to connect to the virtual disk managementAn error occurred attempting to connect to the virtual disk management service on computer localhost.



I checked each of the VM’s on the HV-01 machine and the same error occurs when I selected the “Inspect” option.  When I checked the VM’s running on HV-02 there is not an issue, both of these servers are identical running a failover cluster service with a SAN.

I have restarted the services connected to the Hyper-V’s, the permissions of the services are the same  on each host to nothing has expired on any account used.

If I reboot the host will all of the guests automatically move onto the HV-02, I think this has been done in the past but can’t be sure if the VM’s were all taken offline first.

Given the re-boot does not rectify the permissions issue, does anyone have some ideas on where to go with this?

Many thanks in advance.
mercuriousu2Asked:
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David Johnson, CD, MVPOwnerCommented:
check the permissions on the folder that holds the virtual machines, are you running as a domain administrator?
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mercuriousu2Author Commented:
Hi

This was not a permissions issue, the same access and administrator account was used across all the VM's on the SAN.

I closed down all VM's on the HV-01, rebooted the host and brought the VM's back online and the permissions error on both edit and Inspect was resolved.

Why it happened in the first place I have no idea, maybe I will need to schedule a reboot on the hosts once a month to ensure it does not happen again.

Thanks though for getting back on this :-)
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mercuriousu2Author Commented:
A reboot of the server resolved the permissions issue.
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