A customer needs to select an appropriate Path Selection Policy (PSP) for their storage array.
There is no requirement for a preferred path. The policy should not select a new path unless the
current one fails.
Which PSP meets the requirement?
A.
Fixed
B.
Round Robin
C.
Most Recently Used
D.
Asymmetric Logical Unit Access
Explanation:
C is correct
Most Recently Used (MRU): Selects the first working path, discovered at system boot time. If this path becomes unavailable, the ESXi/ESX host switches to an alternative path and continues to use the new path while it is available. This is the default policy for Logical Unit Numbers (LUNs) presented from an Active/Passive array. ESXi/ESX does not return to the previous path if, or when, it returns; it remains on the working path until it, for any reason, fails.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1011340
with MRU path, if the original path becomes available again, it doesn’t fail back to the original path.
(WRONG) A – Fixed : uses the preferred path to the disk when the path is available; if not it will keep looking for alternative path.
(WRONG) B – Round Robin: performs rotation and load balancing across all available paths.
I don’t think D (Asymmetric Logical Unit Access) is even exist.
So only answer C left.