HP-UX Virtual Partitions Administrator's Guide (includes A.03.05 and A.04.05)

For more information on vparefiutil and all the possible options, see the manpage
vparefiutil(1M).
CAUTION: It is recommended to use the documented procedure of using vparboot -I to
create the virtual partitions so that users do not have to use vparload -E. For information on
the Monitor command vparload, see the Monitor manpage vpmon(5).
vparload -E works in a trial and error fashion, meaning you may have to serially attempt
different disk indices. If there are multiple boot disks belonging to a virtual partition, booting
with vparload -E is easier if the EFI signature of the desired boot disk is known.
Attempting to boot from an incorrect boot disk may result in an ungraceful shutdown or early
panic with the message "root already mounted" if another OS instance is already booted
from that boot disk.
124 Monitor and Shell Commands