Fwd: increase space & umount /tmp in HP-UX

[jj.boland at gmail.com (John Boland)]

that's the trouble with answering email while on vacation and using a
new mail account!

here's my reply to john:

Typically, /tmp is a mounted filesystem.
In HP-UX, /tmp is used constantly and as such can't be unmounted easily.
1) Are you looking to increase space in /tmp or,
2) do you want to take what space /tmp has and return it to /?

1) if you have OnLine JFS installed, you can add the space
dynamically.  If not, it's a bit tricker and requires a reboot. Create
another filesystem called something tricky /t2.

create another logical volume: lvcreate -n lvt2 /dev/vg00
add space to it: lvextend -L 1024 /dev/vg00/lvt2 (this will make lvt2 1 gig).
put a filesystem on it: newfs -F vxfs /dev/vg00/rlvt2
mount it: mount /dev/vg00/lvt2 /t2
copy the current contents of /tmp to /t2
in /etc/fstab: change the device for /tmp from /dev/vg00/lvol5 to /dev/vg00/lvt2
reboot and /tmp will be mounted on the new logical volume.

2) to return /tmp's space to / is bit more involved:
mkdir /t2
in /etc/fstab, change the mountpoint for /tmp to /t2
reboot, /tmp will now be an empty directory and the prior contents
will be visible as /t2, copy what you need.
in /etc/fstab, comment out the mount line for /t2
reboot
/tmp will be part of /, now we can reclaim the space:
lvremove /dev/vg00/lvol5
and add it back to /:
lvextend -L 1024 /dev/vg00/lvol3

Having the OnLine JFS product installed makes these changes a LOT easier.

HTH

-- 
If it ain't broke, you're not trying hard enough!