Hi all,
I hope somebody could bring some light on this 
- I posted here to help others that may end up in the same situation:
ESXi 6.5
--> Datastore1: iSCSI Qnap (main VM datastore)
--> Datastore2: NFS share Qnap (TS-420U v. 4.3.3) for backup only
I have a snapshot of a VM, let’s say “myvm.vmdk”, the file is not locked, the VM is running fine and all .flat, .vmx, etc files seem ok.
Now if the NFS is mounted using NFS v3 I can clone the .vmdk without issues:
vmkfstools -i myvm.vmdk /vmfs/volumes/NFS/test/test.vmkd --> OK
If I dismount and re-mount the same share using NFS v4 the same commands stops at 9% with error:
vmkfstools -i myvm.vmdk /vmfs/volumes/NFS/test/test.vmkd
Clone: 9% done.Failed to clone disk: The file specified is not a virtual disk (15).
NFS v4 is enabled in QNAP config. No multipath is used. All VM vmdks reside on the dedicated iSCSI SAN.
I looked for hours but I couldn't find a clear explanation for this behaviour. Am I missing something obvious?
