06-10-2015
Is the HPUX in question v2 or v3 ?
If the answer is v3, the operation can be online, since on v3, every lun has a WWID.
Just do it port by port, rescan and check paths after each, should not be any issues.
If you want to do it offline, do a vgexport preview (to a file not actual export) of all volume groups on the system using SAN disks (just to be safe do it anyway in each scenario) and deactivate the volume group.
Since the VG info is actually written on disks, even if everything changes (disk names etc.) you will be able to import the volume group using a file you created earlier. There are also other methods (vgscan), but this one is most trivial.
Commands you will require are
scsimgr -> to check lunmap and paths before and after.
ioscan -> to rescan after port change.
This assumes you are using hpux native multipath, not other multipath solutions.
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