HP 3PAR HP-UX Implementation Guide

such as target ports, disks, or individual LUN paths. The status limited means some
paths are taken offline from the available multiple paths.
# ioscan -P health -C tgtpath
Class I H/W Path health
====================================
tgtpath 2 0/0/0/3/0.0x6 online
tgtpath 0 0/0/4/1/0.0x20420002ac000036 online
tgtpath 1 0/0/4/1/1.0x21520002ac000036 offline
#ioscan -P health -C disk
Class I H/W Path health
===============================
disk 2 64000/0xfa00/0x0 online
disk 0 64000/0xfa00/0x23e online
disk 1 64000/0xfa00/0x23f online
disk 3 64000/0xfa00/0x240 limited
disk 4 64000/0xfa00/0x241 limited
# ioscan -P health -C lunpath
lunpath 0 0/0/4/1/0.0x20420002ac000036.0x0 online
lunpath 4 0/0/4/1/0.0x20420002ac000036.0x4001000000000000 online
lunpath 5 0/0/4/1/0.0x20420002ac000036.0x4002000000000000 online
lunpath 1 0/0/4/1/1.0x21520002ac000036.0x0 offline
lunpath 2 0/0/4/1/1.0x21520002ac000036.0x4001000000000000 offline
lunpath 9 0/0/4/1/1.0x21520002ac000036.0x4002000000000000 offline
5. A given DSF file (/dev/disk/diskXX) once allocated to a given unique device (HP 3PAR
StoreServ Storage VV) remains persistent and will not be reused for any other devices (VVs)
even after the original device (VV) is removed. Whenever the actual or original VV reappears,
the same DSF name is allocated.
Example:
Issuing showvlun -a on the HP 3PAR StoreServ Storage shows that the HP 3PAR StoreServ
Storage VV hpcheck is exported as LUN 20.
# showvlun -a
Lun VVname Host -Host_WWN/iSCSI_Name- Port Type
20 hpcheck sqahpit2 50060B00001D1192 1:5:2 host
20 hpcheck sqahpit2 50060B000068D5A4 0:4:2 host
Issue ioscan -kfnNC lunpath to verify that the host recognizes the VV as
/dev/disk/disk20.
# ioscan -kfnNC lunpath
lunpath 15 0/0/4/1/0.0x20420002ac000036.0x4014000000000000 eslpt CLAIMED LUN_PATH LUN path for disk20
lunpath 16 0/0/4/1/1.0x21520002ac000036.0x4014000000000000 eslpt CLAIMED LUN_PATH LUN path for disk20
Remove the LUN and re-export it as LUN 25 and you can see that /dev/disk/disk20 is
recreated for LUN 25 and the LUN path for LUN number 20 goes stale (NO_HW).
HP 3PAR StoreServ Storage:
# showvlun -a
Lun VVname Host -Host_WWN/iSCSI_Name- Port Type
25 hpcheck sqahpit2 50060B00001D1192 1:5:2 host
25 hpcheck sqahpit2 50060B000068D5A4 0:4:2 host
Setting Up Multipathing Software on HP-UX 11i v3 25