[linux-lvm] Resizing a logical volume which is mounted (at /home)

[Kiran Rao]

Thanks for the advice Jess.

Actually I am to blame for this. I did not properly understand the LVM
concept before doing this partitioning. I have lots of free space on
disk but that is *outside* the VG. Only later did I realize that the
whole point of having VGs is to have some free space *within* them!

On Tue, Jan 17, 2012 at 8:06 PM, Males, Jess <jmales at cio.sc.gov> wrote:
> Log in as root:
>
> -              either once the system is completely booted, log in as root
> with the graphical prompt
>
> -              boot into single user mode. i.e. stop grub in its countdown,
> edit the boot configuration by appending single to the list of kernel
> parameters
>
>
>
> Or, boot with a live CD/USB environment.
>
>
>
> I would recommend this last option.  Depending on the live environment, you
> might have to manually detect the volume group, but you’re outside the
> installed system so you can change any logical volume without worry or
> conflict.
>
>
>
> I would suggest the real lesson from all of this is: unless space
> constrained, never commit 100% of your vg.  The whole point of abstracting
> your disk into lvm is for flexibility, and how can you have flexibility
> without a little spare disk to apportion later?  I say this because you
> sound ready to slice X GB off lvhome and immediately commit it all to other
> logical volumes; keep some as spare.
>
>
>
>
>
> -- Jess Males
>
>
>
> From: linux-lvm-bounces at redhat.com [mailto:linux-lvm-bounces at redhat.com] On
> Behalf Of Kiran Rao
> Sent: Monday, January 16, 2012 8:07 AM
> To: linux-lvm at redhat.com
> Subject: [linux-lvm] Resizing a logical volume which is mounted (at /home)
>
>
>
> To start off, here's an overview of my configuration. I'm dual-booting
> Windows XP and Fedora Core 16. When I installed FC 16, here's how I created
> the partitions:
>
> 1) Volume Group (vg_me) - ~73 GB
>
> Out of this, the following are the logical volumes:
> a) lvhome (mount point - /home) - ~48GB
> b) lvroot (mount point - /) ~10GB
> c) lvvar (mount point - /var) ~15GB
>
> So, there's no free space left on the volume group.
>
> Now, I feel the 48GB is not really necessary for the /home. I want to
> redistribute the space among the 3 logical volumes within this VG, or create
> a new one (/tech).  In either case, I want to take the additional space
> (around 20GB) from lvhome and give it to either / or to /tech.
>
> Now, I tried the GUI (system-config-lvm) tool to do this. I can click on
> lvhome and try to resize it. However, the problem is that since I am logged
> in as a non-root user, the /home is mounted. Resizing requires one to
> unmount it, but the unmount operation fails since I am mounted.
>
> How do I work around this?
>
>
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/