This is because of the multipathing policy you are using on the LUNs/storage. Usually happens with MRU (Most Recently Used) policy and active/pasive arrays. Is not a problem, if this is your case everything is fine.
Hi
But I changed all the lun to round robin and still shows one is standby.
Is your storage active/active and supported for RR at VMware HCL? On the datastore, at "Manage Paths" do all paths shows as "Active"?
yes it active/active. It is on the vmware hcl list. Its the dell md3200i iscsi appliance. right clicking on the datatore sshows only 1 path active and one standby.
Well.... checking HCL only MRU is supported:
Have you verified this with Dell?
Also don't believe this is active/active if it uses ALUA and MRU.