How to reduce the LVM size

[Jack_126]

Dear All,

what are the commands to reduce a LVM size.

I dont have on-line jfs.

[Slawomir Gora · Accepted solution]

Hi,

If you don't have OnlineJFS the only way is
1. backup FS
2. use lvreduce command to lvol reduce size
3. create filesystem
4. restore files from backup

[Victor Fridyev]

Hi,

You can find a short discussion here:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?admit=716493758+1101565226073+28353475&threadId=31100
I personally strong recommend to reduce the file system size by backing it up, recreation of its logical volume and restoring.

HTH

[Ranjith_5]

Hi Jack,

Reducing a LV without OnlineJFS is not possible. You have to backup the data, remove and recreate the LV, create a new FS and restore the data from the backup into that FS.

steps are below.
1. Take full backup of File system
2. umount FS
3. lvreduce logical volume ( eg:-# lvreduce -L /dev/vg01/lvdata )
4. newfs
5. mount the FS and restore data

Regards,
Syam

[Hoang Chi Cong_1]

Hi Jack.
Yes, If you do not have Online JFS, you can not reduce the LVM size.
This sample I will reduce /home.
1. Backup all user data
2. Umount the filesystem : umount /home
3. Reduce the size : lvreduce -L 100 /dev/vg01/lvhome
Note: the new total size will be 100MB.
4. Re-create the filesystem newfs -F vxfs /dev/vg01/rlvhome Note: to create an hfs filesystem change vxfs by hfs in the previous command.
5. Mount the Logical Volume: mount /dev/vg01/lvhome /home
6. Restore the user data

Can buy this licence but you have to pay money. It is not cheap :)
You also can download and try this :
http://software.hp.com/portal/swdepot/displayProductInfo.do?productNumber=BASEVXFS


Hope this helps

Jimkery