reduce a filesystem using fsadm

[lawrenzo]

Hello,

I have been tasked to reduce a file system by 1gb and increase an alternate filesystem by that 1gb.

I can increase using online JFS however I am not sure how to reduce the FS and do I need to reduce the LV as well?
Thanks

[Steven E. Protter]

the command is lvreduce.

A word of advice: Don't cut down the by the total amount of free space shown on bdf.

Leave lots of spare space. It is possible to trash the logical volume. Back up the data first before proceeding.

lvreduce is required as part of this process.

SEP

[RAC_1 · Accepted solution]

Backup everything on this lvol.

fsadm -b"new_size"M /dev/vgxx/xxxx
lvreduce -L "new_size"M /dev/vgxx/xxxx

Anil

[Helen French]

I would recommend you backup the file system before making any changes. This document is a good help while using fsadm (OnlineJFS) commands to resize file systems (TKB #LVMKBRC00005082):

http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000066244335

[Hazem Mahmoud_3]

lvreduce can cause data corruption, so here are the steps you want to take:

1. tar all contents of filesystem and store on another filesystem or tape
2. lvreduce
3. untar everything back into filesystem

I think you may want to delete all the contents of the filesystem before you untar everything back into it to ensure you have good data files.
Like everyone said however, backup is key here:)

-Hazem

[lawrenzo]

cool - that's done it for me.

TY all