[linux-lvm] LVM2 problem/disaster

Heinz Mauelshagen Mauelshagen at redhat.com
Fri Feb 27 04:57:01 UTC 2004

On Sat, Feb 21, 2004 at 07:50:28PM +0100, Michaeljohn Clement wrote:
> Hi,
> I recently upgraded lvm2 to 2.00.08 on my Gentoo installation.  After
> rebooting, LVM fails to activate my volume group.  Since I have /home, /usr, and
> /var on LVM, this creates a huge problem for me, and I can't downgrade the LVM
> user-space tools to see if it fixes the problem.
> My main disk is a SATA drive, which is only supported by linux 2.6 kernels.
> I am using kernel 2.6.1, with device-mapper compiled into the kernel.  
> Here's the problem:
> # /sbin/lvchange -a y vg

You mean "vgchange -ay vg", right ?

> /dev/cdrom: open failed: Read-only file system
> device-mapper ioctl cmd 0 failed: Invalid argument
> 0 logical volume(s) in volume group "vg" now active

Set up a device filter in /etc/lvm/lvm.conf in order to avoid needless
spinning on the cdrom device. (see the filter= line).

Run: "vgscan ; vgchange -ay vg"

> I don't know what the /dev/cdrom error is related to, I've never seen that
> before.   Obviously the device-mapper error is the show-stopper.  Is this a
> kernel problem, an LVM2 problem, or something else, and how can I fix it?
> If there's no good way to fix it, then how can I go about recovering my
> data?  KNOPPIX is still using 2.4 kernels, so it won't even be able to access my
> main hard drive, unless there is a KNOPPIX built with 2.6 out there.  Are
> there any live CDs that include both SATA and LVM2 support?  If not, is there
> any other way to recover the data?  Obviously any help would be greatly
> appreciated!
> Thanks,
> Michaeljohn Clement
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Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***


Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
                                                  56242 Marienrachdorf
Mauelshagen at RedHat.com                            +49 2626 141200
                                                       FAX 924446

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