Decrease a filesystem size

[Catherine Forget]

Hi,
I need to decrease the size of a file system on my unix w/s but they do not have onlinJFS. Wat is the equivalent of fsadm to reduce the FS?
Thanks

[Adam W.]

Man "lvreduce"

The man page should contain more than enough information to proceed.

[Patrick Wallek · Accepted solution]

If you don't have OnlineJFS installed, then you can reduce a file system on the fly.

In this case your steps are:

1) Back up your data
2) unmount the file system
3) lvremove the LV
4) lvcreate the LV as the new, smaller, size.
5) newfs the the LV
6) mount the LV
7) restore your data

[James R. Ferguson]

Hi Catherine:

Because Unix has more than one way to do almost anything, in lieu of Patrick's step #3 and #4, you could 'lvreduce' the logical volume to its smaller size. Then proceed with step-5-7.

OnlineJFS is extremely valuable not only for dynamic resizing, but also for the ability to perform snapshot backups and the additional mount options it offers for your VxFS filesystems. You shouldn't leave home without it :-)

Regards!

...JRF...

[Adam W.]

my apologies.

First you should reduce the Filesystem(s).

tar -c /filesystem
umount (filesystem)
newfs -F vxfs -s (size) /path
mount (filesystem)
tar -x /filesystem (use prefered restore util now)

THEN use lvreduce to reduce the LV.

[Adam W.]

I love it when people ASSIGN POINTS for taking time out of our lives to assist other. Simply Amazing.

[TTr]

> I need to decrease the size of a file system ...

Which filesystem? It better not be one of the standard OS volumes/filesystems.

[Catherine Forget]

Actually, Adam W., I assigned points.
I do not know why they are not there.
Thank you