topic Re: extending the root filesystem in Operating System - HP-UX

extending the root filesystem

Amit Manna_5 — Wed, 11 Mar 2009 14:13:40 GMT

How can we increase the root filesystem.
There is no online JFS on the system

Re: extending the root filesystem

Court Campbell — Wed, 11 Mar 2009 14:17:48 GMT

take an ignite image of the system with the -I option. Then ignite the box. / needs to be contiguous. There are other options, but ignite is probably the easiest.

Re: extending the root filesystem

Patrick Wallek — Wed, 11 Mar 2009 14:20:34 GMT

Use Ignite/UX to create a make_tape_recovery tape. Then boot from that tape and recover your OS. During the recovery you can resize your file systems.

Re: extending the root filesystem

T G Manikandan — Wed, 11 Mar 2009 14:25:21 GMT

During the interactive recovery of the make_tape_recovery archive you can resize the file system but you need to see as why you need to increase the root file system.

what is the current size and what is the usage of this file system. there are not much files in there which could be more than 200 mb.

Use

#du -kx /|sort -nr|more

to find which directories are occupying more space with /

Re: extending the root filesystem

T G Manikandan — Wed, 11 Mar 2009 14:30:11 GMT

make sure you use the -l option with make_tape_recovery which is recommended to perofrm the interactive recovery.

Re: extending the root filesystem

MarkSyder — Wed, 11 Mar 2009 14:38:17 GMT

As T G says, you need to ask if this is really necessary.

Is the filesystem growing? If not, it can happily run for a long time at 90% + full. If it is growing, you almost certainly have an application writing to it that should be writing to a dedicated filesystem.

Check for core files and check for ordinary files (type f) in /dev. One of the most common reasons for root filling is someone mis-typing a tape device name and ending up with a large text file in /dev.

Mark Syder (like the drink but spelt different)

Re: extending the root filesystem

Court Campbell — Wed, 11 Mar 2009 16:38:00 GMT

If you do not use VxVM, you can uninstall Base-VxVM. That will free up some space. But I usually only do that if I am in a desperate situation.

Re: extending the root filesystem

Steven E. Protter — Wed, 11 Mar 2009 16:47:05 GMT

Shalom,

Bill Hassell usually says, extending the root file system should not be needed.

It is not intended for files, and you probably have some files on it.

du -k | sort -rn | more

Find the problem spot and make some cuts.

Because root must be contiguous, an Ignite restore is the only way to "extend" the root file system.

SEP

Re: extending the root filesystem

Avinash20 — Wed, 11 Mar 2009 17:18:06 GMT

Here are some steps that you will need to follow in order to change the size of your root filesystem using Ignite/UX and the make_recovery tape.
---------------------------------------------------------------------
1. Install Ignite-UX on your system
2. run make_recovery (with relevant options), to create bootable tape
3. reboot your system & Press a key to abort non-interactive recovery.
4. Select appropriate language.
5. Select Advanced Options from the menu (3rd option).
6. Select Edit Config from the submenu (2nd option).
7. Change the last RECOVERY entry in the file to RECOVERY=TRUE and exit vi.
8. Select Install HP-UX from the menu (1st option).
9. Choose either Guided or Advanced Installation (advanced is required for changing filesystems).
10. Complete all other required information and select Go! to begin the recovery.

Please assign points to your threads

Good Luck !

Re: extending the root filesystem

Steve Post — Thu, 12 Mar 2009 11:23:31 GMT

I apologize if this is patronizing. I have no idea if you have even stumbled on this issue in the past.

One reason why a person would want to extend a root filesystem is that they want to drop 300 megs into a new directory called /stuff because the "stuff" software company said it MUST be there.

But you don't have to extend the root filesystem for this. There are other options.

You could make a new filesystem and mount it to a new directory called /stuff. The 300 megs of space would be grabbed from a different disk, and NOT be taking root's filesystem space.

You could make a directory /stuff relative to a big old disk on the system and link it back to root.
Let's say you have a big old disk with 3 gigs free on it.
Let's say the disk is mounted to /bigdisk.
You could do this:
mkdir /bigdisk/stuff
cd /
ln -/bigdisk/stuff /stuff
Now /stuff looks like it is in root. But it is using the space on the /bigdisk filesystem.

Funny story: I had a guy blow up a root filesytem on a computer because he wanted to store if 500 megs of stuff. So he made a directory like /mystuff. Then uploaded the data there. Since /mystuff was not a filesystem or a link to a bigger filesystem, it just ate up the space in root's filesystem. Then ....bomb.

Funny... he is also the guy that needed to delete that pesky file that just happened to be called *

Re: extending the root filesystem

Johnson Punniyalingam — Thu, 12 Mar 2009 11:31:52 GMT

First of all /stand, swap space and / need to contigeous.

In order to increase any of them, you will have to use ignite and
resize the partitions.

First check why you need to extend /. / is static file system and
should not grow if you /var etc on different file systems. The good practise
is to have /var on different filesystem.

On top of ignite, you could also do this manually from LVM Maintenance
mode.

As an example, I had to increase the size of /stand for a recent 11i
upgrade.
Below, my lvol1 is stand and lvol2 is primary swap (used to have swap
on lvol3 as well) and root is lvol4.

boot into LVM maintenance mode:

hpux -lm

vgchange -a y /dev/vg00
lvrmboot -r /dev/vg00
lvremove /dev/vg00/lvol2
lvextend -L 256 /dev/vg00/lvol1
extendfs /dev/vg00/rlvol1
lvcreate -L 1024 -C y -r n -n lvol2 /dev/vg00
lvlnboot -b /dev/vg00/lvol1
lvlnboot -r /dev/vg00/lvol4
lvlnboot -s /dev/vg00/lvol2
lvlnboot -d /dev/vg00/lvol2
lvlnboot -R
reboot -r

What you could do is remove your primary swap - extend root - then add
swap back with what is left.

Of course this is not for the meek of heart :)

The ignite way is probably easier...

The real question is, why do you want to increase your root filesystem?

Better to move that which does not belong into a new lvol...

Thanks,
Johson

Re: extending the root filesystem

Johnson Punniyalingam — Thu, 12 Mar 2009 11:34:06 GMT

First, do a "vgdisplay -v vg00" and a "bdf" to determine what file
systems you have that are not part of the / file system. Then do a "du -sk
/* |sort -n" to see the size of what exists under /, ignoring the other
mounted file systems. This will tell you where most of the space is
being consumed.

Rgds,
JOhnson

Re: extending the root filesystem

Shailendran V Naidu — Thu, 12 Mar 2009 14:30:10 GMT

Hi Amit,
If you want to increase the root file system with out Online JFS, the only way is to Re-ignite with a make_tape_recovery or make_net_recovery archive(period).