> I know this a site for Hp3000, But we are transitioning to a HP9000 - HP-UX
> plus a SAN environment.

Sorry dude.

> I want to know if someone could answer the question
> on if /opt and /home and /tmp could be on the SAN and not on the system
> disc.?

Actually you could boot the entire machine from a SAN. This would
obviate the need to do something like Mirror/UX or another RAID setup
for your boot disk. Certainly, /opt /home and /tmp can be moved off
the system disk. All that really needs to be on a boot device is
/stand, /sbin, /dev, /etc, and a bit of swap.
>
> Also if there are any rules to follow on which should be a mount point..
>
> Should /opt , /usr/ /dev be there own mount points..

Those rules are always "rules of thumb", meaning they may or may not
apply. /dev is required at boot time, before filesystems can be
mounted, so I wouldn't ever try that one. There's not a lot of upside
I've seen to moving those others into their own mount point. Even if
you just have large number of small disks, you can still create a
single volume group out of them with LVM.

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