Most SAN storage devices allow you to increase the size of a logical drive. To do this you:
1) Physically add a new hard disk
2) Assign the hard disk to an array
3) Increase the logical drive by the required amount of data
If you do this in a vmware VMFS environment, you will not be able to access the additional capacity. The Datastore will show a higher capacity but the VMFS partition will remain the same size. To increase the size of a VMFS partition you need to use “extents”. Extents allow you to put multiple LUNS together so that a VMFS partition can span across them. Note that this applies to LUNS. A single LUN should have no more than 1 VMFS partition on it. Hence the correct way to add storage is not to increase the size of the logical drive but to create a new logical drive – give it a new LUN and use Extents to add the new LUN to the existing VMFS
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