Don't be a moron and do what I did: vxupgrade /stand and /
On system using VxFS4.1 on HP-UX 11.23, the disk layout version
for "/" (root) and "/stand" may become unusable.
The commands vxupgrade and vxfsconvert in vxfs 4.1 and later have
the ability to upgrade the disk layout version of / and /stand
to dlv 6+.
The HP-UX bootloader cannot recognize the upgraded disk layout
and is unable to find a kernel to boot.