topic Re: Reduce a File System in Operating System - HP-UX

Reduce a File System

alessandro_37 — Thu, 10 Jun 2004 07:07:56 GMT

Dear all, i wont reduce a my filesystem (i am trying with using a Test Filesystem).

my HP-UX is:
HP-UX hptest B.11.00 U 9000/800 580776597 unlimited-user license but note that i don't have installed "FSADM" utility to increase/reduce a filesystem.

The filesystem test to reduce is an Vxfs type:
/dev/vg01/test 40960 1118 37358 3% /test

How can I use lvreduce it?
(i have already expanded this filesystem with lvextend and extendfs command but i don't know about the reduce)

Can you help?
Thanks Alex

Re: Reduce a File System

Mark Grant — Thu, 10 Jun 2004 07:11:13 GMT

Without OnlineJFS, you can't. You have the option of creating a new smaller one and copying all the data over though.

Re: Reduce a File System

KapilRaj — Thu, 10 Jun 2004 07:11:26 GMT

To reduce u will need to re-create the filesystem.

1. Backup data
2. umount /mount_point
3. lvreduce ......
4. newfs ...
5. mount /mount_point
6. Restore data

Regds,

Kaps

Re: Reduce a File System

Bharat Katkar — Thu, 10 Jun 2004 07:13:56 GMT

Alex,
Reducing fileSystem doesn't guarantee of data in it. First backup the data and then try reducing it as below.

# lvreduce -f -L /dev/vg01/test

Remeber after reducing the final size of File System would be the one you entered above.
-f forcefull operation

Also see man lvreduce

Hope that helps.
Regards,

Re: Reduce a File System

Bharat Katkar — Thu, 10 Jun 2004 07:17:35 GMT

Alex,
Also even though it doesn't guarantee of data but i have seen it intact couple of time. It depends on how PE are allocated to your FS at lower level.

Suppose you have 10 GB FS and data 5 GB and you are reducing it to 7 GB then there are chances that it may show your data after reduction.

But don't take chances backup your data first.
If you are lucky enough then restoring headache will go away.

Regards,

Re: Reduce a File System

alessandro_37 — Thu, 10 Jun 2004 07:24:55 GMT

Thanks for You information.
Incredible if i haven't OnlineJFS I can't reduce a filesystem!!

How can verify is OnlineJFS is installed?
Normally i use this examotage:

fsadm -F vxfs -DEed /test/path1
I receive this message:
sadm: the -d and -e options require "HP OnLineJFS (Advanced Vxfs)"

There is anoter modality to verify it?

i have already used this command:
swlist | grep -i jfs (is it correct ??)
Thanks a lot
Alex

Re: Reduce a File System

Mark Grant — Thu, 10 Jun 2004 08:33:51 GMT

Your swlist command line is correct. If you get nothing, you haven't got it. To get it, you have to pay for it I'm afraid.

Re: Reduce a File System

Fabio Ettore — Thu, 10 Jun 2004 08:59:02 GMT

Ciao Alessandro,

as other ITRC people said you cannot reduce a filesystem without OnLineJFS.

If you obtained those messages on -d and -D options sure you have not it. Anyway launch

# swlist -l product | grep -i online
or
# swlist -l product | grep -i jfs

You should not see anything about OnLineJFS.

Best regards,
Ettore