reduce space on filesystem to reallocate on other filesystem

[sassou]

hi,
I want to reduce space on filesystem to reallocate on other filesystem.
All the file system belongs to the sam volume group.

[Pete Randall]

If you have OnlineJFS you can do this with the fsadm command. If not, you will have to backup your data and recreate the lvol/filesystem.


Pete

[Joseph Loo]

hi,

u mean u like to perform lvreduce? please bear in mind that lvreduce will "wipe out" all info from that logical volume.

or do u mean u like to do a rm first before mv to another file system?

regards.
(p.s. by the way, i believe u have not assign points for a number of posts)

[SIJU JOSE]

Hi

You can try the following
http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&admit=-1335382922+1085657763569+28353475&docId=200000063231654

HTH
Siju

[SIJU JOSE]

Hi

Or this

http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000063231654

Siju

[Mark Grant]

Well my take is this.

If you have onlineJFS you can do this online by first reducing the filesystem with "fsadm". Then you reduce the logical volume wiht "lvreduce". Then increase the second logical volume with "lvextend" and then increase it's filesystem with "fsadm".

If you do not have onlineJFS then you can not decrease the filesystem even though you can reduce the logical volume. If, by chance, you have space at the end of you filesystem then you are OK. Otherwise, as Pete says, you need to recreate the logical volume and filesystem to the new size.

[Cheryl Griffin]

You can reward the many people who have assisted you by assigning points to their posts.

For steps how to assign points see:
http://forums1.itrc.hp.com/service/forums/helptips.do?#33

[SAHA]

Take full backup of file system before lvreduce command.

Thanks,

[Rita C Workman]

You got good tips already on how to reduce filesystems...but sometimes instead of reducing and adding, I look at simply moving data around to be more I/O efficient ....So....

Is this filesystem you want to reduce on maybe in the same volume group as the one you want to add to...???

Maybe you could look at doing pvmove to simply move the data on one lvol (in first fs) to another lvol (in second fs).

Just a thought, may not apply in your case...but you never know...
Rgrds,
Rita

[Geoff Wild]

Before reducing, defrag may be appropiate:

fsadm -F vxfs -d -D -e -E /mountpoint

then fsadm -b M /mountpoint

then lvreduce -L /dev/vgXX/lvolXX

Rgds...Geoff