Expanding a datastore

[jeffj2000]

I have some 3TB datastores, each with a 2TB VM and they suddenly need 1TB more space. I assume I have 2 options, expand the existing datastore, or something create a new 3TB datastore and add a new 1TB vmdk to the VM on this datastore. 

I am leaning towards just expanding the datastore, then when I add the new disk it will be on the same datastore.

I have only expanded a datastore once and it worked well. I went to our array, changed the volume size, then went into vCenter and chose the datastore and select increase size and just added the new extent.

Is this reliable or did I just get lucky my only time?

[a_p_]

>>> I went to our array, changed the volume size, then went into vCenter and chose the datastore and select increase size...
Yes, that's how this is usually done.

In the early ESX/ESXi times, when datastore sizes were limited to max. 2TB, on needed to add a new LUN as an extent. This worked, but was similar to a RAID0 where you got in trouble if one of the extents failed.

André