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What is one requirement when adding an extent to a VMFS datastore?
A. A new unused NFS mount
B. An RDM with sufficient space available
C. An unused iSCSI or FCP LUN
D. Free space on the LUN holding the VMFS datastore
Correct Answer: C
Explanation/Reference:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2000643
An extended VMFS volume may contain from two to 32 physical extents. Each extent is either a primary partition or a logical partition within an extended partition.
These extents can be on one LUN or on multiple LUNs. In the latter case, some of these LUNs can have multiple extents on the volume.
For a VMFS volume, there is a rule of one VMFS per LUN. SCSI-2 Reservation locking in ESXi locks the entire LUN and not a specific partition. Therefore, the best practice is to have one LUN per VMFS only (exception being local storage).
When using extents, gather multiple LUNs under one logical VMFS and not multiple partitions per LUN.
