Hey guys how do you reduced a disk space in lvm?

For reducing a logical volume, you can use the following command.

# lvreduce -L 16 /dev/vg01/data

Replace 16 with the final size of the logical volume in MBs.
Replace /dev/vg01/data with the appropriate logical volume device file.

Caution: If the logical volume contains any file system, the file-system need to be reduced first. And before the file -system can be reduced, it should be defragmented.

Suggestion: Take backup of the logical volume data and then do lvreduce. After reducing lv, restore the data backup.

Do you have online-JFS?
If so use fsadm... then lvreduce
e.g. (live!)
ant # fsadm -b 500000 /home
fsadm: /etc/default/fs is used for determining the file system type
vxfs fsadm: /dev/vg00/rlvol5 is currently 819200 sectors - size will be reduced
vxfs fsadm: allocations found in shrink range, moving data
ant # lvreduce -L 500 /dev/vg00/lvol5
Warning: rounding up logical volume size to extent boundary at size "504" MB.
When a logical volume is reduced useful data might get lost;
do you really want the command to proceed (y/n) : y
Logical volume "/dev/vg00/lvol5" has been successfully reduced.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
ant #


All the best