[linux-lvm] Mounting two logical volumes to the same mount point

[Heinz Mauelshagen]

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
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> 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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