Re: [linux-lvm] Re: vgscan - volume group not found, panic!

["Heinz J. Mauelshagen" <Mauelshagen@sistina.com>]

On Fri, May 25, 2001 at 09:14:21AM +0200, Luca Berra wrote:
> On Fri, May 25, 2001 at 12:38:04AM +0200, Gerben Meijer wrote:
> > Dear LVM users and developers,
> > 
> > I am experiencing problems with LVM. I am running Debian GNU/Linux 2.2 with
> > a 2.4.3-ac11 kernel, and LVM utils v0.9 (i use the packages from bunk at
> > http://people.debian.org/~bunk/debian/dists/potato/main/binary-i386/). I had
> 
> (note to developers: i am starting to believe taht bumping IOP in b6 was not such
> a bad idea, if that helps us getting rid of broken tools.
> mebbe we should bump IOP in vanilla kernel....)

Thanks Luca, you are the first who argues for that beside us :-)

But people did complain about the need to upgrade both driver and tools/lib
at the same time.
IMHO not a big deal, because the patch is automagically created by
the make process anyway; just the additional kernel compile/install might
suck a little bit.

Any additional votes?

Regards,
Heinz    -- The LVM Guy --

> 
> > Then I decided to try to upgrade to the latest LVM version, both in the
> > kernel and the userspace utilities. So i patched my 2.4.3 kernel with the
> > latest LVM patches (0.9.1beta7). I got an error while compiling my kernel
> > though, get_hardblocksize wasn't defined anywhere. So i went back digging on
> 
> just replace get_hardblock_size with get_hardsect_size in drivers/md/lvm.c
> or get latest version from cvs
> 
> > google and found one patch that fixed that for me:
> > http://www.stacken.kth.se/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.4a
> > a2.bz2.
> 
> i dunno which LVM version does andrea use in his patches
> 
> > So finally i had a working kernel with the latest LVM drivers, and i had the
> > latest LVM userspace utils, and i had my hopes up. Unfortunately, vgscan
> > still didn't see anything, and vgcfgrestore gave me an error
> > (vg_check_consistency_with_pv_and_lv).
> > 
> > Next, I tried using 2.4.4-ac9 with the original 0.9 userspace utilities.
> > Still nothing.
> 
> in case you did not guess it from my note above original 0.9 userspace utils are bad
> for your health
> 
> > I'm out of options here, and I am hoping that you can help me rescue my
> > data. If you have any idea what I could try to fix this, please let me know.
> > 
> > Debugged output i created:
> sigh this debug output is very hard to read, anyway at the end you see
> <55555> pv_read_uuidlist -- LEAVING with ret: 2
> this means it only found the uiid for 2 PV (not 3)
> they are u9.... and M4.... (sda1 and hda2)
> cross checking with pvdata output shows you have a known problem
> 
> i'll attach a mail from Andreas Dilger with a solution for this.
> 
> good luck!
> L.
> 
> 
> -- 
> Luca Berra -- bluca@comedia.it
>         Communication Media & Services S.r.l.
>  /"\
>  \ /     ASCII RIBBON CAMPAIGN
>   X        AGAINST HTML MAIL
>  / \

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> From: Andreas Dilger <adilger@turbolinux.com>
> Message-Id: <200104022100.f32L0jL13101@webber.adilger.int>
> Subject: Re: [linux-lvm] Problem with UUID, vgscan, vgcfgrestore
> In-Reply-To: <01040207434300.00937@darkvader> from Diederick van Dijk at "Apr
>  2, 2001 07:43:43 am"
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> Date: Mon, 2 Apr 2001 15:00:44 -0600 (MDT)
> 
> Diederick van Dijk writes:
> > I've a LVM of 8 physical volumes that I've created with LVM 0.9.1 beta 2.
> > I've the know problem that vgscan reports that it can't find my VG.
> > So I upgraded to LVM 0.9.1 beta 6 (tools and kernel) and runned on each
> > physical disk a vgcfgrestore. Unfortunately I didn't solve the problem.
> > Attached is the output of the commands vgdisplay -v and a pvdata -U for each 
> > physical disk. Debug logs a very huge so I won't attach them.
> 
> OK, I have figured out why vgcfgrestore doesn't work properly with broken
> UUIDs.  It is because vgcfgrestore only restores the backup VGDA data to
> each disk separately.  This means it is not possible to have consistent
> UUIDs generated for all PVs in a VG when vgcfgrestore is run.
> 
> You can try the following (experimental) procedure to fix the UUIDs:
> 
> Check each PV with "pvdata -PP /dev/hdX" to ensure it has a valid
> UUID assigned.  Also get the PV numbers (starting with 1) for each of
> the PVs.  Finally, check the pv_uuidlist_on_disk.base for each PV.
> It will normally be 6144, but it does not have to be.
> 
> for each PV (in PV# order)
>     dd if=/dev/hdX bs=1 skip=44 count=128 >> /tmp/uuids
> 
> This should create a file /tmp/uuids which has all of the PV UUIDs in it.
> Make sure there are as many UUIDs in the file ("od -a /tmp/uuids" is good)
> as you have PVs (8 in your case).
> 
> Now, we want to write the UUID list back to the PVs so vgscan is happy:
> 
> for each PV (in any order)
>     dd if=/tmp/uuids of=/dev/hdX bs=1 seek=<pv_uuidlist_on_disk.base for hdX>
> 
> example:
>     dd if=/tmp/uuids of=/dev/hda2 bs=1 seek=6144
> 
> Now vgscan should be able to detect all of the disks and work properly.
> 
> Cheers, Andreas
> -- 
> Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
>                  \  would they cancel out, leaving him still hungry?"
> http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert
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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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