Recover rootvg (vg00) using ignite tape backup

Take the Root vg (vg00) backup @ tape drive use the below command

# make_tape_recovery -v -x inc_entire=vg00 -a <Tape_Drive_Device_File>

#make_tape_recovery -I -v -x inc_entire=vg00 -a /dev/rmt/0mn

The tape will be completely erased and recreated when you run the command.
 

Recover VG00 - Boot with backup tape:

Reboot the system, ON IPL do sea ipl. this will list tape device.

IPL>sea ipl
IPL>bo from p1(assuming p1 is tape device)

This wil start interactive HP-UX install.