lvreduce

[Michael Elleby III]

By accident, I performed an lvextend on a base JFS filesystsem without unmounting the filesystem. BDF reports the exact size of the lv (512), but SAM reports the new size of 1024.

How can I correct this? I cannot remember.. Will it correct itself on reboot, or will I need to do an lvreduce to restore actual size in vg00.conf?

[Sanjay_6]

Hi,

I think you have to unmount, lvreduce ,mount.
Did you do extendfs after lvextend. You may have to run fsck on the LV.

Hope this helps

Thanks

[Michael Elleby III]

I didn't do the extendfs, only the lvextend command...

It is the /opt filesystem.. I didn't think I could umount this one...

[Stefan Farrelly · Accepted solution]

Simply use lvreduce to reduce it back to its original size before you lvextended it. You can do it online, no need to unmount or reboot.

[Michael Elleby III]

Thanks Steven, I thought I would be able do it, I just wanted to be sure...

Mike-

[AUJ]

if you're objective is to continue to extend the logical volume, do the ff:

1. umount the filesystem
2. extendfs -F vxfs /dev/vg??/rlvol?
3. mount the filesystem

but if want to reduce it...

lvreduce -L size /dev/vg??/lvol??

Hope the above will help.

Angelo