Re: The operation on file "/vmfs/devices/deltadisks/test.vmdk" failed. ESXi 6.0

Hi
I have seen this quite often last months.
The trick is to clone the disk once via vmkfstools -i current.vmdk new.vmdk
ESXi can handle this type of vmdks but will not create snapshots - so backing up such a disk via Veeam&Co is impossible.
Once converted into standard "VMFS" format and your problems will be history.
Ulli