Thanks for clearing my doubt on the limitations.
Actually, all four hosts are able identify the LUN under storage devices. But when i try to create a NEW datastore out of this always i am able to see only 3 hosts getting detected.
Lets say if i have host1, host2, host3, host4 either i see "Shared Datastore" detects host1, host2, host4 or host2 host3 host4 or host 1 host3 host4, like this i am facing issue.
I am not able to figure out why all the four hosts are not getting detected.
FYI : I am using deployment size of "Medium" for vcenter appliance.