A new LUN has been presented to two ESXi hosts, ESXiA and ESXiB. The LUN can be seen from both servers. A new VMFS volume is created on the LUN using a vSphere Client attached to ESXiB. The new datastore is visible on ESXiB. but not on ESXiA. What steps must be taken to make the datastore visible to ESXiA?

A.
Perform a Rescan operation on ESXiB

B.
Modify LUN masking settings on the storage array

C.
Reboot ESX Server A

D.
Perform a Rescan operation on ESX Server A

Explanation:
iSCSI SAN Configuration Guide, page 26.
The VMkernel discovers LUNs when it boots, and those LUNs are then visible in the vSphere Client. If changes are made to the LUNs, you must rescan to see those changes.

* New LUNs created on the iSCSI storage
* Changes to LUN access control
* Changes in connectivity