From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (mx1.redhat.com [172.16.48.31]) by int-mx1.corp.redhat.com (8.12.11.20060308/8.12.11) with ESMTP id k4VMkhCj014728 for ; Wed, 31 May 2006 18:46:43 -0400 Received: from mail.gmx.net (mail.gmx.de [213.165.64.20]) by mx1.redhat.com (8.12.11.20060308/8.12.11) with SMTP id k4VMkgNu023266 for ; Wed, 31 May 2006 18:46:42 -0400 Date: Thu, 01 Jun 2006 00:39:39 +0200 Subject: Re: [linux-lvm] rescue data after hd crash References: <20060531124546.GF13142@dragonhold.org> <20060531213154.GA2236@redhat.com> From: chris MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Message-ID: In-Reply-To: <20060531213154.GA2236@redhat.com> Reply-To: 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; format="flowed"; delsp="yes"; charset="iso-8859-1" To: mauelshagen@redhat.com, LVM general discussion and development Thanks Heinz, this looks like what i was serching for. still, it didn't work out. 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") but also "1 logic voliume(s) .. now active". lvscan says "Volume group ... not found" mount fails. what should i try next? regards, Chris PS: about the stripes, I don't think I have any. On Wed, 31 May 2006 23:31:54 +0200, Heinz Mauelshagen =20 wrote: > > 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 =20 >> 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 = >> 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 =20 >> 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/ >