[linux-lvm] Questions

Heinz Mauelshagen mauelshagen at redhat.com
Mon Mar 5 11:53:23 UTC 2007

On Sat, Mar 03, 2007 at 08:59:38PM -0500, Stuart D. Gathman wrote:
> Which display commands display on-disk metadata, which display 
> lvmtab/lvmtab.d, and which display kernel data structures?  I'd like to 
> know if the metadata is trashed on my original two PVs, or just on
> the new one I tried to add.

Because you're refering to LVM1, you see kernel metadata unless you
provide the -D option to the *display commands.

> Given my situation described previously (where vgextend/me screwed up and 
> kernel data is fine, VG is active, but disk metadata seems to be toast),
> should I run vgcfgrestore on the live VG in the hope that things might 
> boot?  I have Centos-3  /etc/lvmconf backups of metadata (I think) for
> prior to the attempt to vgextend.

Make sure that your /etc/lvmconf backup is alright for your case
by running "vgcfgrestore -ll -f ...".
If so, vgcfgrestore it after initializing the PVs with pvcreate -f.

> What is the equivalent of pvremove (which is what I needed) in LVM1?
> I tried using pvcreate "I'm really really sure", but that seems to have
> screwed up.  If VG metadata is stored at the beginning of a PV, then
> I guess dd might be the answer.

There's no pveremove in LVM1, so dd of 512 bytes of zeroes will do.

> Does the last /etc/lvmconf entry respresent the result of the last 
> command?

/etc/lvmconf contains a backup history including the actual
VG configuration.

> Or is it a backup of things just before the last autobackup
> command?
> -- 
> 	      Stuart D. Gathman <stuart at bmsi.com>
>     Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
> "Confutatis maledictis, flammis acribus addictis" - background song for
> a Microsoft sponsored "Where do you want to go from here?" commercial.
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


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
Storage Development                               56242 Marienrachdorf
Mauelshagen at RedHat.com                            PHONE +49  171 7803392
                                                  FAX   +49 2626 924446

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