HP-UX 11i v3 Native Multi-Pathing for Mass Storage (September 2009)

• /dev/[r]disk/disk17
For each LUN device, the esdisk driver selects by default the round-robin dynamic I/O load
balancing policy.
Viewing native multi-pathing related information
Hardware paths to lunpaths, targetpaths, and LUNs
Run ioscan to see the hardware paths for SCSI HBA, target paths, lunpaths, and LUNs in the agile
view.
There are two Fibre Channel SCSI HBAs:
# ioscan -kfnC fc
Class I H/W Path Driver S/W State H/W Type Description
================================================================
fc 0 0/2/1/0 td CLAIMED INTERFACE HP Tachyon XL2 Fibre Channel Mass
Storage Adapter
fc 3 0/4/1/0 td CLAIMED INTERFACE HP Tachyon XL2 Fibre Channel Mass
Storage Adapter
The agile view shows two target ports with world-wide names 0x500508b3009097f1 and
0x500508b3009097f9 and four target paths:
# ioscan -kfnNC tgtpath
Class I H/W Path Driver S/W State H/W Type Description
...
tgtpath 7 0/2/1/0.0x500508b3009097f1 estp CLAIMED TGT_PATH fibre_channel
target served by td driver
tgtpath 3 0/2/1/0.0x500508b3009097f9 estp CLAIMED TGT_PATH fibre_channel
target served by td driver
tgtpath 8 0/4/1/0.0x500508b3009097f1 estp CLAIMED TGT_PATH fibre_channel
target served by td driver
tgtpath 6 0/4/1/0.0x500508b3009097f9 estp CLAIMED TGT_PATH fibre_channel
target served by td driver
The lunpaths are represented by a concatenation of the target path hardware path and the LUN 64
bit address (for example,
0/2/1/0.0x500508b3009097f9 + LUN address 0x4014000000000000).
The following
ioscan output shows a few lunpaths:
# ioscan -kfnNC lunpath
Class I H/W Path Driver S/W State H/W Type Description
...
lunpath 15 0/2/1/0.0x500508b3009097f1.0x0 eslpt CLAIMED LUN_PATH
LUN path for ctl2
lunpath 16 0/2/1/0.0x500508b3009097f1.0x4014000000000000 eslpt CLAIMED LUN_PATH
LUN path for disk17
lunpath 19 0/2/1/0.0x500508b3009097f1.0x4015000000000000 eslpt CLAIMED LUN_PATH
LUN path for disk16
lunpath 17 0/2/1/0.0x500508b3009097f1.0x4016000000000000 eslpt CLAIMED LUN_PATH
LUN path for disk13
lunpath 18 0/2/1/0.0x500508b3009097f1.0x4017000000000000 eslpt CLAIMED LUN_PATH
LUN path for disk15
lunpath 20 0/2/1/0.0x500508b3009097f1.0x4018000000000000 eslpt CLAIMED LUN_PATH
LUN path for disk14
lunpath 0 0/2/1/0.0x500508b3009097f9.0x0 eslpt CLAIMED LUN_PATH
LUN path for ctl2
lunpath 5 0/2/1/0.0x500508b3009097f9.0x4014000000000000 eslpt CLAIMED LUN_PATH
LUN path for disk17
lunpath 4 0/2/1/0.0x500508b3009097f9.0x4015000000000000 eslpt CLAIMED LUN_PATH
LUN path for disk16
lunpath 1 0/2/1/0.0x500508b3009097f9.0x4016000000000000 eslpt CLAIMED LUN_PATH
LUN path for disk13
lunpath 3 0/2/1/0.0x500508b3009097f9.0x4017000000000000 eslpt CLAIMED LUN_PATH
LUN path for disk15
14