A simple example would be a SCSI disk connected to two SCSI controllers on the same computer or a disk connected to two Fibre Channel ports. Should one controller, port or switch fail, the operating system can route I/O through the remaining controller transparently to the application, with no changes visible to the applications, other than perhaps incremental latency.
Features of Multipath:
* Dynamic load balancing
* Traffic shaping
* Automatic path management
* Dynamic reconfiguration
How to find multipath on hp ux ??
# strings /etc/lvmtab
# vgdisplay -v vgname
2.Native Multipathing (11.31) (agile device name)
# ioscan -m dsf h/w address
Examble : ioscan -m dsf/dev/rdisk/disk586
Persistent DSF Legacy DSF(s)
# scsimgr -D lun_map (which will give the number of paths to that lun)
# ioscan -kfnNC (will show the persistent device file in 11.31)
# evainfo (EVA) and xpinfo (XP) - commands will show the multipaths for luns.