I would like to extend size of a datastore on an ESXi 4.0 machine. There are two LUNs configured and two datastores using them. Datastore 1 is running out of space and I would like to add free space from datastore 2. However when I go to Datastore 1 --> Proprties --> Increase then the "Increase Datastore Capacity" window is completely blank. The question is - why?
Is that because I need an empty LUN to use for the expansion or is it bacause the ESX is running from the same LUN as the Datastore 1?