hello,
i had the same problem, i fixed it with a little startup script.
First try to:
Reboot the HP - UX machine. (keep ur storage running)
then it wont find the Fibre Channel Disks.
Try just an IOSCAN.
and then look with ioscan -funC disk if the Storage Disks are available.
If they are available after a ioscan and you are able to do a vgchange -a y vgxx, just put a little script in your /sbin/rc3.d/
i called it S101ioscan_startup.sh -->
ioscan > /dev/null
vgchange -a y vgxx > /dev/null
and then link this file to /sbin/init.d
then try a reboot and look if the discs are available.
it tryed it often and it works all the time
sorry for my bad english i hope you are able to understand everything.
have a nice day..
msd