HP-UX Virtual Partitions Administrator's Guide (includes A.05.02)

Monitor and Shell Commands
EFI Boot Disk Paths, including Disk Mirrors, and vparefiutil (Integrity only)
Chapter 5
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If you add a boot disk at a known hardware path, it may not be possible to immediately
boot from this new disk.
Solution:
• If the EFI signature of the disk is known, the vparload -E command can be used to
boot from the disk.
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.