[linux-lvm] Resizing the root LVM partition

[linux-lvm] Resizing the root LVM partition

[Jonathan Morace]

I'm having a problem adding disks to my root partition, which is using
LVM.  The quick summary is that I think I need to run resize2fs on the
root partition, but I can't figure out how to unmount the root
partition to do so.

The longer version of the story...  I'm running Fedora Core 2, and
when I installed I had the root partition configured to be on two
disks using LVM.  I added two more disks to the computer and followed
the howto to initialize the disks, add the physical volumes to the
volume group, and extend the logical volume.  When I run "lvdisplay" I
see my logical volume is the correct size, but "df" only shows the
original size.  I'm assuming this is because I haven't done a
"resize2fs".  The reason I haven't is because I can't figure out how
to unmount the root filesystem in order to do this.  If I boot with
linux rescue, I can choose not to mount the filesystems, but then the
LVM devices don't exist.  I read somewhere that running "lvm vgscan -v
--mknodes" should do the trick, but as far as I could tell, no devices
were created.

Any ideas on how I can get the root partition resized to include the new disks?

Thanks for the help,

Jonathan

Re: [linux-lvm] Resizing the root LVM partition

[Klaus Strebel]

Jonathan Morace schrieb:
> I'm having a problem adding disks to my root partition, which is using
> LVM.  The quick summary is that I think I need to run resize2fs on the
> root partition, but I can't figure out how to unmount the root
> partition to do so.
> 
> The longer version of the story...  I'm running Fedora Core 2, and
> when I installed I had the root partition configured to be on two
> disks using LVM.  I added two more disks to the computer and followed
> the howto to initialize the disks, add the physical volumes to the
> volume group, and extend the logical volume.  When I run "lvdisplay" I
> see my logical volume is the correct size, but "df" only shows the
> original size.  I'm assuming this is because I haven't done a
> "resize2fs".  The reason I haven't is because I can't figure out how
> to unmount the root filesystem in order to do this.  If I boot with
> linux rescue, I can choose not to mount the filesystems, but then the
> LVM devices don't exist.  I read somewhere that running "lvm vgscan -v
> --mknodes" should do the trick, but as far as I could tell, no devices
> were created.
> 
> Any ideas on how I can get the root partition resized to include the new disks?
Hi Jonathan,

if you take a look to the list-archive, you'll find more detailed answer.

In short, boot from a recovery media / Live-CD ( you can't umount root 
to resize the fs! ), resize your rootfs, reboot.

Ciao
Klaus
-- 
Mit freundlichen Gr�ssen / best regards

Klaus Strebel, Dipl.-Inform. (FH), mailto:klaus.strebel@gmx.net

/"\
\ /     ASCII RIBBON CAMPAIGN
  X        AGAINST HTML MAIL
/ \

Re: [linux-lvm] Resizing the root LVM partition

[AJ Lewis]

[-- Attachment #1: Type: text/plain, Size: 1738 bytes --]

On Mon, Sep 12, 2005 at 02:10:20PM -0700, Jonathan Morace wrote:
> I'm having a problem adding disks to my root partition, which is using
> LVM.  The quick summary is that I think I need to run resize2fs on the
> root partition, but I can't figure out how to unmount the root
> partition to do so.
> 
> The longer version of the story...  I'm running Fedora Core 2, and
> when I installed I had the root partition configured to be on two
> disks using LVM.  I added two more disks to the computer and followed
> the howto to initialize the disks, add the physical volumes to the
> volume group, and extend the logical volume.  When I run "lvdisplay" I
> see my logical volume is the correct size, but "df" only shows the
> original size.  I'm assuming this is because I haven't done a
> "resize2fs".  The reason I haven't is because I can't figure out how
> to unmount the root filesystem in order to do this.  If I boot with
> linux rescue, I can choose not to mount the filesystems, but then the
> LVM devices don't exist.  I read somewhere that running "lvm vgscan -v
> --mknodes" should do the trick, but as far as I could tell, no devices
> were created.
> 
> Any ideas on how I can get the root partition resized to include the new disks?

Run 'lvm vgchange -ay' after the vgscan command and your devices should be
there. 
 
-- 
AJ Lewis                                   Voice:  612-638-0500
Red Hat                                    E-Mail: alewis@redhat.com
One Main Street SE, Suite 209
Minneapolis, MN 55414
   
Current GPG fingerprint = D9F8 EDCE 4242 855F A03D  9B63 F50C 54A8 578C 8715
Grab the key at: http://people.redhat.com/alewis/gpg.html or one of the
many keyservers out there...


[-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --]

Re: [linux-lvm] Resizing the root LVM partition

[Jonathan Morace]

> > On Mon, Sep 12, 2005 at 02:10:20PM -0700, Jonathan Morace wrote:
> > I'm having a problem adding disks to my root partition, which is using
> > LVM.  The quick summary is that I think I need to run resize2fs on the
> > root partition, but I can't figure out how to unmount the root
> > partition to do so.
> >
> > The longer version of the story...  I'm running Fedora Core 2, and
> > when I installed I had the root partition configured to be on two
> > disks using LVM.  I added two more disks to the computer and followed
> > the howto to initialize the disks, add the physical volumes to the
> > volume group, and extend the logical volume.  When I run "lvdisplay" I
> > see my logical volume is the correct size, but "df" only shows the
> > original size.  I'm assuming this is because I haven't done a
> > "resize2fs".  The reason I haven't is because I can't figure out how
> > to unmount the root filesystem in order to do this.  If I boot with
> > linux rescue, I can choose not to mount the filesystems, but then the
> > LVM devices don't exist.  I read somewhere that running "lvm vgscan -v
> > --mknodes" should do the trick, but as far as I could tell, no devices
> > were created.
> >
> > Any ideas on how I can get the root partition resized to include the new disks?
> 
> On 9/13/05, AJ Lewis <alewis@redhat.com> wrote:
> Run 'lvm vgchange -ay' after the vgscan command and your devices should be
> there.

Thank you very much, that was exactly what I needed.  For anyone else
trying to figure this out...

1. Boot from Fedora install cd (type "linux rescue" from the boot promp)
2. When asked whether you want to find Fedora installations, choose "Skip".
3. Run "lvm vgscan -v --mknodes"
4. Run "lvm vgchange -ay"
5. Run "efsck -f /dev/Volume00/LogVol00" (resize2fs prompted me to do
this first)
6. Run "resize2fs /dev/Volume00/LogVol00"
7. Reboot, and everything is good.

Thanks,

Jonathan

Re: [linux-lvm] Resizing the root LVM partition

[Fredrik Tolf]

On Mon, 2005-09-12 at 14:10 -0700, Jonathan Morace wrote:
> The longer version of the story...  I'm running Fedora Core 2, and

Doesn't FC2 come with the kernel patches for online Ext2/3 resizing? Try
running ext2online on your LVM device.

Fredrik Tolf