Can you open the properties of the storage group and go to the hosts tab in engineering mode? Click on the advanced button and check to see if all paths are active.  Option 2: reboot.
I have a host which is only seeing 2 paths for all luns, while all other hosts are seeing 4 paths. A sample lun is shown below: Pseudo name=emcpowerq CLARiiON ID=APM00071602762 [hp1] Logical device ID=6006016018C21C00F44A96B635E2E111 [TST_C1S0U01] state=alive; policy=CLAROpt; priority=0; queued-IOs=0; Owner: default=SP A, current=SP A       Array failover mode: 1 ============================================================================== --------------- Host ---------------   - Stor -   -- I/O Path --  -- Stats --- ###  HW Path               I/O Paths    Interf.   Mode    State   Q-IOs Errors ==============================================================================    0 lpfc                     sddx      SP A5     active  alive       0      0    1 lpfc                     sdeo      SP A4     active  alive       0      0 Ive noted that some luns only show "A" ports and others only show "B" ports, but no luns show both "A" and "B" ports. On other hosts, I see that each and every luns has both "A" and "B" ports for a total of 4. Ive chekced the zoning to make sure that both host HBA's can see both SPs. Ive also checked the "host connectivity" to ensure that both host HBA's are defined and assigned to the host in the array itself. Unsure why this is happening, or how to diagnose further. Suggestions welcome.
Host only sees 2 out of 4 paths