Hello,
When you go to the storage adapters and do a re scan of the adapter , does it reflect with the new size of 2TB.? Only if the new storage is reflected on the storage adapters - you will
be able to increase the size from the properties of the data store -- under Host -- configuration -- storage tab. By directly connecting or launching a vsphere client to the Host.
I have seen this to happen when trying to perform the operation using the vcenter server
Thanks,
Avinash