Multiple Virtual Machine’s went into paused in a Hyper-v cluster throwing error “Disk(s) running out of space” – Typical Issue

Immediate Observations:

• Only few Virtual machines went to paused state and observed all VM’s are coming from single volume let’s say Volume 1
• Volume1 is having 30 % free space , checked with storage team whether the LUN is thick or thin as sometimes LUN may be exhausted if they allocated as thin. It is a thick LUN and no issues observed from storage
• Tried to resume the VM, after sometime VM moving to pause state
• Tried to move the CSV disk from one node to another – No Luck
• Observed that there is no single recommended hotfix installed on any node in a cluster but all nodes are up to date with all critical patches

Resolution

• Based on above findings, assumed that there is some known issues would be there as  error is misleading us to  DISK’s are running out of space though 30% free space available. 
• As there was no single recommended hotfix  installed in cluster , initially installed Hype-v 2012 hotfixes on one node and taken restart.
• Move the Victim volume to the recently restarted node. – No issues  observed
• Post keeping an observation, installed all recommended hotfixes

Finally, I am unsure which hotfix resolved exactly but I have seen below forums where these issues addressed in KB2791729 but it is a private hotfix