[CentOS] LVM

[Markus Falb]

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!
-- 
Kind Regards, Markus Falb

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