On rp3440, why SAM lists 2 LUNs as 1 disk not 2?

[newa]

The server got 2 LUNs each with 2TB space (from HP StorageWorks 6400 Enterprise Virtual Array)
But SAM/Disk Device page displays only 1 disk with 2TB and listed the hardware paths to the 2nd
LUN as alternate paths to the first disk. I expected SAM would list 2 disks with 2 TB on each.
Did I miss anything here?

Thanks a lot in advance!

#######################################
# ioscan -fnkCdisk
Class I H/W Path Driver S/W State H/W Type Description
=============================================================================
disk 0 0/0/2/0.0.0.0 sdisk CLAIMED DEVICE TEAC DW-224E
/dev/dsk/c0t0d0 /dev/rdsk/c0t0d0
disk 1 0/1/1/0.0.0 sdisk CLAIMED DEVICE HP 36.4GMAS3367NC
/dev/dsk/c2t0d0 /dev/rdsk/c2t0d0
disk 2 0/1/1/0.1.0 sdisk CLAIMED DEVICE HP 36.4GMAS3367NC
/dev/dsk/c2t1d0 /dev/rdsk/c2t1d0
disk 4 0/3/1/0.1.18.0.0.0.1 sdisk CLAIMED DEVICE HP HSV400
/dev/dsk/c4t0d1 /dev/rdsk/c4t0d1
disk 9 0/3/1/0.1.18.0.0.0.2 sdisk CLAIMED DEVICE HP HSV400
/dev/dsk/c4t0d2 /dev/rdsk/c4t0d2
disk 3 0/3/1/0.1.18.255.0.0.1 sdisk CLAIMED DEVICE HP HSV400
/dev/dsk/c5t0d1 /dev/rdsk/c5t0d1
disk 7 0/3/1/0.1.18.255.0.0.2 sdisk CLAIMED DEVICE HP HSV400
/dev/dsk/c5t0d2 /dev/rdsk/c5t0d2
disk 6 0/3/1/0.1.20.0.0.0.1 sdisk CLAIMED DEVICE HP HSV400
/dev/dsk/c6t0d1 /dev/rdsk/c6t0d1
disk 10 0/3/1/0.1.20.0.0.0.2 sdisk CLAIMED DEVICE HP HSV400
/dev/dsk/c6t0d2 /dev/rdsk/c6t0d2
disk 5 0/3/1/0.1.20.255.0.0.1 sdisk CLAIMED DEVICE HP HSV400
/dev/dsk/c7t0d1 /dev/rdsk/c7t0d1
disk 8 0/3/1/0.1.20.255.0.0.2 sdisk CLAIMED DEVICE HP HSV400
/dev/dsk/c7t0d2 /dev/rdsk/c7t0d2

############## SAM display ############

Disk Devices 0 of 4 selected│
│───────────────────────────────────────────────────────────────────────│
│ Hardware Number Volume Total │
│ Path of Paths Use Group Mbytes Descript │
│┌────────────────────────────────────────────────────────────────────┐ │
││ 0/0/2/0.0.0.0 1 Unused -- 0 DVD-ROM/C │
││ 0/1/1/0.0.0 1 Unused -- 34732 HP 36.4GM │
││ 0/1/1/0.1.0 1 LVM vg00 34732 HP 36.4GM │
││ 0/3/1/0.1.18.0.0.0.1 8 LVM vgsan 2097151 HP H │


##################################
Alternate Path
┌──────────────────────────────────────────┐
││ 0/3/1/0.1.18.0.0.0.2 |
││ 0/3/1/0.1.18.255.0.0.1 │
││ 0/3/1/0.1.18.255.0.0.2 │
││ 0/3/1/0.1.20.0.0.0.1 │
││ 0/3/1/0.1.20.0.0.0.2 │
││ 0/3/1/0.1.20.255.0.0.1 │
││ 0/3/1/0.1.20.255.0.0.2 |

[newa]

The OS is HP-UX 11i v2.