[linux-lvm] Mounting two logical volumes to the same mount point
Heinz Mauelshagen
mauelshagen at redhat.com
Wed Jun 21 08:24:34 UTC 2006
On Tue, Jun 20, 2006 at 09:07:29PM +0200, Aad Rijnberg wrote:
> Hi,
>
> my logical volume that contains /usr appears to be too small. I already
> removed some applications that I did not need, but it is still on the edge.
> Now that there are a lot of updates, I get the complaint of yum that there is
> not enough free space on /usr.
>
> I just bought an additional harddisk which I also needed for other purposes,
> and would like to reserve part of this new drive for extra LVM space. I have
> just created a new volume group (VolGroup01) on the new drive, and a logical
> volume (LogVol01) inside that physical volume group.
>
> Can I mount both /dev/mapper/VolGroup00-LogVol01 (which contains the /usr data
> on the "old" drive) and /dev/mapper/VolGroup01-LogVol01 to the /usr mount
> point? Or can only one logical volume be mounted to a mount point?
Aad,
you can only mount one device with a filesystem on the same mountpoint.
What needs doing in order to grow your logical volume containing the usr
filesystem, is to *add* the second drive to the existing volume group on the
first one and grow usr afterwards (LV and FS).
Carry out the follwoing steps (or use system-config-lvm):
lvremove VolGroup01/LogVol01
vgremove VolGroup01
vgextend VolGroup00 /dev/sdb # or whatever the drive is
# replace 5G with the capacity you want to add
lvextend -L+5G VolGroup00/LogVol01
How to grow the FS depends on the type; for ext2/3 you'ld run:
ext2online /dev/VolGroup00/LogVol00
>
> Aad
>
> _______________________________________________
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
--
Regards,
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
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Heinz Mauelshagen Red Hat GmbH
Consulting Development Engineer Am Sonnenhang 11
Storage Development 56242 Marienrachdorf
Germany
Mauelshagen at RedHat.com PHONE +49 171 7803392
FAX +49 2626 924446
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