Suddenly I realized:
What OS are you familiar with?
in HPUX, you should not have a main root filesystem, the OS by default uses more than just one filesystem when you install it...
In lvm you would have vg00 ( equivalent to AIX rootvg) the volume group used for the OS
And usually you would have:

Code:

ran:/home/vbe $ bdf|grep vg00
/dev/vg00/lvol3     307200   54696  236775   19% /
/dev/vg00/lvol1     199381   79387  100055   44% /stand
/dev/vg00/lvol7    2048000  639480 1320685   33% /var
/dev/vg00/lvol8    4096000    6624 3835569    0% /var/adm/crash
/dev/vg00/lvol6    1536000 1001171  501446   67% /usr
/dev/vg00/lvol5     500000   62904  410367   13% /tmp
/dev/vg00/lvol9    2527232 1825601  657840   74% /opt
/dev/vg00/lvol4     350000  174103  165919   51% /home

But you will notice lvol2 doesnt appear => bdf doesnt show swap...

All this to say it doesnt make much sence to only mirror / in this case...
You are to mirror the whole volume group or at least all the OS.

All the same , the system backup tool IgniteUX doesnt backup only / ... (man make_tape_recovery(1M))