On Sun, Mar 18, 2012 at 08:04:14PM +0100, Markus Falb wrote: > On 18.3.2012 18:34, madunix at gmail.com wrote: > > I need to shrink /home(755G) to 150GB and use free space to add to the > > existing /(50G). > > #df -kh > > Filesystem Size Used Avail Use% Mounted on > > /dev/mapper/vg_web-lv_root 50G 7.8G 40G 17% / > > tmpfs 7.8G 384K 7.8G 1% /dev/shm > > /dev/sda2 485M 79M 381M 18% /boot > > /dev/sda1 200M 256K 200M 1% /boot/efi > > /dev/mapper/vg_web-lv_home755G 6.2G 711G 1% /home > > > > Need to have the step, can this be done online or need to go offline > > (umount) the file systems. > > What filesystem? Assuming ext3, this cannot shrunk without unmounting. > I believe the following *should* work for ext3 > > $ umount /home > $ e2fsck -f /dev/vg_web/lv_home > $ resize2fs /dev/vg_web/lv_home 150g > $ lvresize -L 150g /dev/vg_web/lv_home > $ mount /home > > I am not sure how safe it is. Take care! I was under the impression that you needed to unmount the file system to shrink it with resize2fs (you can grow it online however). Ray