vMotion failing Unable to access virtual disk 'Hard disk 1' from the host.

[thehaag]

Hi all,

I’ve got an issue with vMotion. I a problem trying to migrate from one clusters Datastore to another. I get the following errors:

Unable to access virtual disk 'Hard disk 1' from the host.

Either the host is disconnected from the datastore or has insufficient privilege. Details: Unable to access file [Datastore]

the Datastore is accessable and the VMKernal adapter has vMotion enabled (and is not the management port) 

many ideas what the cause may be? 

[thehaag]

vCenter reports the host is connected however under datastores, config, connectivity it’s unmounted and I get the following error trying to mount it 

Atomic test and set of disk block returned false 

[aakibdawood]

Does this apply to your case: https://kb.vmware.com/s/article/2086839 

Let me know.