Hello All
We have a client with a Server 2008 R2 Hyper v server with 4 VM s ( 1 SBS server , 1 Windows XP VM and 2 Windows 7 VM s).One Windows 7 VM is configured with Dynamically expanding VHD with Maximum size set to 60GB and currently that drive is now 60GB and the Windows XP VM is configured with again a dynamically expanding VHD with maximum size set to 150 GB and the current size of the VHD is 119GB.Other 2 M s have fixed VHDs.
All of those VM s reside on a 1TB partition which is on a RAID 5 volume directly attached to the physical server. This partition now has just over 50GB of free disk space.
On 2 occasions the 2 VM s with dynamically expanding VHD s were paused with the following events logged on hyper v VMMS admin log
Event-1
Log Name: Microsoft-Windows-Hyper-V-VMMS-Admin
Source: Microsoft-Windows-Hyper-V-VMMS
Date: 4/8/2014 6:37:03 AM
Event ID: 16050
Task Category: None
Level: Warning
Keywords:
User: SYSTEM
Computer: name-Host
Description:
'name of the VM' is about to run out of disk space on 'D:\Hyper-V\ Virtual Hard Disks\'. (Virtual machine ID 44798757-7590-4B31-9ED1-2F397F0ED1C0)
Event-2
Log Name: Microsoft-Windows-Hyper-V-VMMS-Admin
Source: Microsoft-Windows-Hyper-V-VMMS
Date: 4/8/2014 9:26:31 AM
Event ID: 16060
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Computer: name-Host
Description:
'Name of the VM’ has been paused because it has run out of disk space on 'D:\Hyper-V\virtual Hard Disks\'. (Virtual machine ID 44798757-7590-4B31-9ED1-2F397F0ED1C0)
When I checked the log exactly the same has happened on 3-28-2014 and one of my colleagues has resumed the VM s and the VM s were working fin till yesterday. Also there were no option but to resume the VM s yesterday as well and both VM s are working as expected till now.
I did some research and found that there is a bug on windows 2012 which can cause issues like this but no such bugs for server 2008 R2.
- Can someone let me know how hyper v calculates the available free disk space?
- I’m inclined to think these issues were caused by the low disk space on the partitions and dynamically expanding disks on the VM s but I’m confused as to why it started working without any issues since 3-28-2014 till yesterday and even yesterday since now.
- If this is actually related to low disk space on the partition on the hyper v server, what are my options? Convert the disks to fixed or add more disk space?
Many thanks
Dhanushka