In Powerpath only 3 out of 4 SAN paths are showing

Issue

• In Powerpath only 3 out of 4 SAN paths are showing, as shown below:

# powermt display dev=all
Pseudo name=emcpowera
CLARiiON ID=APM00104401245 [GREENE]
Logical device ID=60060160E6202900B27144E14A06E111 [GREENE_LUN 1335]
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   qla2xxx                   sdb       SP B6     active  alive      0      0
 1   qla2xxx                   sdc       SP A7     active  alive      0      0
 1   qla2xxx                   sdd       SP B7     active  alive      0      0

* Devices do exist in /dev:

# ls -la /dev/sd*
brw-r----- 1 root disk 8,  0 Feb 13 16:11 /dev/sda
brw-r----- 1 root disk 8,  1 Feb 13 16:15 /dev/sda1
brw-r----- 1 root disk 8,  2 Feb 13 16:14 /dev/sda2
brw-r----- 1 root disk 8,  3 Feb 13 16:15 /dev/sda3
brw-r----- 1 root disk 8, 16 Feb 13 16:11 /dev/sdb
brw-r----- 1 root disk 8, 17 Feb 23 16:03 /dev/sdb1
brw-r----- 1 root disk 8, 18 Feb 23 16:03 /dev/sdb2
brw-r----- 1 root disk 8, 19 Feb 23 16:03 /dev/sdb3
brw-r----- 1 root disk 8, 32 Feb 13 16:11 /dev/sdc
brw-r----- 1 root disk 8, 33 Feb 13 16:15 /dev/sdc1
brw-r----- 1 root disk 8, 34 Feb 13 16:15 /dev/sdc2
brw-r----- 1 root disk 8, 35 Feb 13 16:15 /dev/sdc3
brw-r----- 1 root disk 8, 48 Feb 13 16:11 /dev/sdd
brw-r----- 1 root disk 8, 49 Feb 13 16:15 /dev/sdd1
brw-r----- 1 root disk 8, 50 Feb 13 16:15 /dev/sdd2
brw-r----- 1 root disk 8, 51 Feb 13 16:15 /dev/sdd3