Problem trying to extend /usr

[Peter Caddy]

Hi
I am trying to extend /usr. I rebooted to single user mode, then ran lvextend on lvol7. When I try to run extendfs it fails, saying cannot extend a mounted fs. If I try and unmount the file system, I get the error cannot unmount /usr : block device required

Any ideas on how I can progress? Unfortunately I forgot to note how big the LV was before extending it

[Mauro Gatti]

You can extend a logical volume "online" (that mans You can do a "lvextend" on a mounted logical volume) but You can't extend filesystem (that means You can't do a "extendfs") on a mounted lv.
The only way You have to extend a filesystem "online" is to use "Online JFS" that is a licesend HP product.
When you extend a FS using "extendfs" You must use r-named-special file.
If You have Online JFS "fsdm" needs directory name.

RGDS

[Mark Grant]

One thing I noticed once whilst trying to unmount /usr in single user mode was that I ran a "bdf" before doing anything else. This used a library that was in /usr so I couldn't unmount it. In other words, make sure the first thing you do is unmount /usr.

Alternatively I once increased the logical volume (which you can do online) and then put the "extendfs" command in the startup scripts before it attempts to mount /usr. This means that you can set it all up, re-boot, and the filesystem is increased as it comes up.

[Pete Randall]

Your /usr got mounted some where along the line and you need to get it unmounted. Simply reboot again into single user mode and run your extendfs command from there.


Pete

[Peter Caddy]

I found another forum message where someone else got the block device required message. In that one, there had been a problem unmounting the /usr file when the system was shutdown before the reboot, and the entry for /usr had not been taken out of the /etc/mnttab file (or something like that). As a result, some commands thought the /usr filesystem was mounted when it wasn't. I was able to mount the file system, then unmount it. Then I was able to extendfs successfully

[Bill Kimbell]

If you haven't purchased online JFS then you can reboot (do a setboot -b off) and at the ISL prompt type in: hpux -is. This will boot the system without mounting any logical volumes. Type in mount -a to mount lvol's (you can do a bdf at this point to see the size of /usr) then umount /dev/vg00/lvol7 which will take /usr offline and allow you to do an lvextend and then an extendfs. Do a bdf to confirm the new size and then reboot.
(/var requires the same approach)
Bill

[Tim D Fulford]

Boot into single user mode, and extend filesystem in single user mode (i.e. /usr is not mounted yet!)

# shutdown -r -y now
at press any key to interupt boot sequence, do so...
ISL> boot
ISL> interact with ISL prompt> y
ISL> hpux -is
# vgchange -a y vg00
# extendfs -F vxfs .... ...
# init 3

Regards

Tim

[Suresh Patoria]

Hi

1) shutdown -ry 0

2) Interrupt the system by pressing the space bar and boot with ISL

3)ISL>hpux -is

4)umount the /usr
#exec umount /usr

5)set the shell to use the commands
#unset HISTFILE
#exec sh

6>lvextend -L <> /dev/vg00/lvol7

7>extendfs /dev/vg00/rlvol7

8>shutdown -ry 0

Thanx

[Elmar P. Kolkman]

Or reboot to LVM maintenance mode (-im) next time you want to do this instead of single user mode. The commands you need (extendfs and lvextend) are both in /sbin.