From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 1 Jun 2006 01:25:57 +0200 From: Heinz Mauelshagen Subject: Re: [linux-lvm] rescue data after hd crash Message-ID: <20060531232557.GP2242@redhat.com> References: <20060531124546.GF13142@dragonhold.org> <20060531213154.GA2236@redhat.com> Mime-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: Reply-To: mauelshagen@redhat.com, LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="iso-8859-1" To: LVM general discussion and development Cc: mauelshagen@redhat.com On Thu, Jun 01, 2006 at 12:39:39AM +0200, chris wrote: > Thanks Heinz, >=20 > this looks like what i was serching for. still, it didn't work out. >=20 > the first call of this command issued (apart from multiple "couln't find = =20 > device..") > "device-mapper ioctl cmd 9 failed: Das Argument ist ung=EF=BF=BDltig" > (i hate german error messages, who invented this? it says "illegal =20 > argument") >=20 > but also "1 logic voliume(s) .. now active". Well, looks like your Logical Volume got activated. Of course with a hole punched out (the missing drive). Try to mount it manually. Heinz >=20 > lvscan says "Volume group ... not found" > mount fails. >=20 > what should i try next? >=20 > regards, Chris >=20 > PS: about the stripes, I don't think I have any. >=20 > On Wed, 31 May 2006 23:31:54 +0200, Heinz Mauelshagen =20 > wrote: >=20 > > > >vgchange -ay --partial > > > >On Wed, May 31, 2006 at 01:45:46PM +0100, Graham Wood wrote: > >>On Wed, May 31, 2006 at 02:34:04PM +0200, chris wrote: > >>> I have create a volume group with 4 250GByte harddisks with an ext3 = > >>file > >>> system on the 1TB result. > >>Stripe or concat? > >> > >>> now the third harddisk failed and the volume group is "dead" - =20 > >>obviously. > >>The way you created the volume had no redundancy - therefore 25% of =20 > >>your data is gone, as > >>well as the volume's "completeness". > >> > >>If you did a concat, then you (with playing) may be able to get some =20 > >>data back from the > >>first 500GB of the volume - but I wouldn't want to rely on anything =20 > >>that came back from it. > >>I'd suggest getting hold of 2 identical blank disks, and doing a binary= =20 > >>(dd) copy of disks 1 > >>and 2 to them - and then work on them. You might be able to use =20 > >>vgcfg{backup,restore} to > >>tell the system that this volume is actually only on 2 disks.... =20 > >>However, anything that > >>references data > 500GB into the volume is almost definitely lost - =20 > >>because although you've > >>got 750G-1TB, it's almost all going to be linked back into the section = =20 > >>that you've lost. > >> > >>If you did a stripe, then you can forget getting any data back off it. = =20 > >>You've lost every > >>4th block of whatever size you striped on. E.g. with a 64k stripe =20 > >>size, you'll have lost > >>from 128k-192k, 384k-448k, etc. - and there's almost definitely going = > >>to be nothing > >>salvagable from that. > >> > >>Graham > >> > >>_______________________________________________ > >>linux-lvm mailing list > >>linux-lvm@redhat.com > >>https://www.redhat.com/mailman/listinfo/linux-lvm > >>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > > >=20 >=20 > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ =3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D= -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-= =3D-=3D- Heinz Mauelshagen Red Hat GmbH Consulting Development Engineer Am Sonnenhang 11 Storage Development 56242 Marienrachdorf Germany Mauelshagen@RedHat.com PHONE +49 171 7803392 FAX +49 2626 924446 =3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D= -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-= =3D-=3D-