HOWTO increase the size of a Logical Volume

[Raperswil]

Guys,
I need to install some patches, hence I need to increase the size of /var and /tmp.

BACKGROUND:
I have a 9GB disk on 1st channel and a 140GB disk on 2nd. I created one VOLUME GROUP (vg00) out of both of these. Filesystem is vxfs and VOLUME MANAGEMENT is LVM. For some reason the installer created:
/var = 3.5 GB
/tmp = 1 GB
/home = 30MB (ha ha)

I need to install some patches, so I need to increase the size of /tmp where I will UNTAR the patches to 5GB. /var I want to increase to 10GB. /home by 10GB.

Now to find what logical volumes map to which mount points, I issued 'bdf'.
/var ---> /dev/vg00/lvol6

I issued the foll:
A.
lvextend -L 300 /dev/vg00/lvol6
|
\---------> ? Size in MB / KB ?
Anyway this command completed OK.

B.
Now I need to issue extendfs
umount /dev/vg00/lvol6

error: this is in use (or some such msg)

How can I extend these partitions? How can I unmount them?

Also please let me know
A.
lvextend -L extends by MB / KB OR extends to x MB/KB.
B.
extendfs -f vxfs /dev/vg00/lvol6
Does this merely sync the extension on the physical leve.
C.
Lastly, I got lvextend right and did not extendfs /var. And shutdown my system? Will I run into troubles?

Thanks for your replies in advance.
TK

[Sandman!]

Look into purchasing the OnlineJFS product so you can extend lvols online w/o unmounting them (boot, root and swap being the exceptions). lvextend(1M) will expand an lvol by MB...see the man page. Your sequence of steps is incorrect. For the right sequence of expanding an lvol is given in the extendsfs_vxfs(1M) manpage.

[Raperswil]

"Look into purchasing the OnlineJFS product so you can extend lvols online w/o unmounting them (boot, root and swap being the exceptions)."

Thanks for the info, but I am a home user, I won't be able to spend an more money.


" lvextend(1M) will expand an lvol by MB...see the man page."
Thanks. I am following Marty's HP-UX sysadmin handbook and toolkit.

" Your sequence of steps is incorrect. For the right sequence of expanding an lvol is given in the extendsfs_vxfs(1M) manpage."
OK, I will see the man page. Thanks.

Meanwhile any suggestion to work with what I have will be appreciated. Thanks

[Torsten.]

To extend LVOLs containing file systems like /var /usr or /opt you need to boot to single user mode, if you don't have onlineJFS installed.
Doing this, the file systems will remain unmounted, not busy.
Now you can do your lvextend and extendfs.
man pages are worth being read - you will learn all the details.

[Torsten.]

Good point to start:

http://docs.hp.com/en/B2355-90950/ch06.html

(Managing Systems and Workgroups: A Guide for HP-UX System Administrators
- Chapter 6 Administering a System: Managing Disks and Files)

[Sp4admin]

After all that was said above. The other option is to use an ignite tape to extend the lvol size. of course this would cause a reboot.

sp,

[Tim Nelson]

Here is what I used to do when I ran out of room in /var for patches and did not want to rebuild the system.

cleanup -c 1 ( this cleans up superceded patches )

If that was not enough. Create new filesystem for /var/adm/sw copy all patch files to new filesystem. Delete the old and mount the new.

Cleanup all the unneeded junk in /var/(mail|adm|sam|tmp|... )

Remove all those uneeded software packages that are not required ( this would free up /opt )

[MarkSyder]

Tim has given you the answer I would have given, but just in case you're unsure how to go about it:

1. create a new filesystem; e.g. /var/adm/sw.new

2. cd /var/adm/sw

3. find . -xdev -depth -print|cpio -pmd /var/adm/sw.new

4. cd /etc

5. cp -p fstab fstab.safe

6. vi fstab and swap /var/adm/sw with /var/adm/sw.new

7. reboot. When the server comes back up, the new filesystem will now be called /var/adm/sw and you have all the space you need for your patches.

Mark Syder (like the drink but spelt different)