On Sun, Mar 18, 2012 at 08:04:14PM +0100, Markus Falb wrote:
> On 18.3.2012 18:34, madunix@xxxxxxxxx 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
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