From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8AECC433EF for ; Tue, 19 Oct 2021 06:05:11 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4DD13611EF for ; Tue, 19 Oct 2021 06:05:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 4DD13611EF Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=buadh-brath.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=redhat.com Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-96-0hoi5HC7NBSzxZO4-Rjl6w-1; Tue, 19 Oct 2021 02:05:06 -0400 X-MC-Unique: 0hoi5HC7NBSzxZO4-Rjl6w-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A04AA10A8E00; Tue, 19 Oct 2021 06:05:00 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 74F6219C79; Tue, 19 Oct 2021 06:05:00 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 0EE604E9F5; Tue, 19 Oct 2021 06:04:56 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 19IMLEUd005305 for ; Mon, 18 Oct 2021 18:21:14 -0400 Received: by smtp.corp.redhat.com (Postfix) id A90402166B26; Mon, 18 Oct 2021 22:21:14 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast01.extmail.prod.ext.rdu2.redhat.com [10.11.55.17]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A3C282166B25 for ; Mon, 18 Oct 2021 22:21:11 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id BD347899EC0 for ; Mon, 18 Oct 2021 22:21:11 +0000 (UTC) Received: from friday.buadh-brath.com (drochaid.buadh-brath.com [45.33.103.245]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-549-zrXkbPxdO6iiPBvGFTMw2g-1; Mon, 18 Oct 2021 18:21:09 -0400 X-MC-Unique: zrXkbPxdO6iiPBvGFTMw2g-1 Received: from [69.133.187.32] (helo=buadh-brath.com) by friday.buadh-brath.com with esmtp (Exim 4.89) (envelope-from ) id 1mcb0G-0006FD-To; Mon, 18 Oct 2021 22:21:08 +0000 Received: by buadh-brath.com (Postfix, from userid 1000) id 758D3201C0; Mon, 18 Oct 2021 18:20:53 -0400 (EDT) Date: Mon, 18 Oct 2021 18:20:53 -0400 From: Brian McCullough To: Zdenek Kabelac Message-ID: <20211018222053.GE29981@bdmcc-us.com> References: <20211018180853.GF28058@bdmcc-us.com> MIME-Version: 1.0 In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-loop: linux-lvm@redhat.com X-Mailman-Approved-At: Tue, 19 Oct 2021 02:03:39 -0400 Cc: LVM general discussion and development Subject: Re: [linux-lvm] Help restoring a corrupted PV partition ( 18th ) X-BeenThere: linux-lvm@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-lvm-bounces@redhat.com Errors-To: linux-lvm-bounces@redhat.com X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=linux-lvm-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Mon, Oct 18, 2021 at 11:40:39PM +0200, Zdenek Kabelac wrote: > Dne 18. 10. 21 v 20:08 Brian McCullough napsal(a): > > > >I have had a disk go bad on me, causing me to lose one PV. Thank you for the thoughts, Zdenek. No, it was a hardware failure. Bad blocs, unreadable sectors, etc. According to ddrescue, this partition was recovered without any problems, although, as I observe later, the first part of the partition is zero. > > > >If I am not providing sufficient, or the proper, information, feel free > >to ask for more. > > > > > >I seem to have retrieved the partition using ddrescue and put it on to > >a new drive, but it seems to be missing some label information, because > >pvscan doesn't recognize it as a PV partition. > > > >Using hexdump, I see the string " LVM2 " at 0x1004, but nothing before > >that. The whole 16 bytes is: > > > >0x01000 16 d6 8e db 20 4c 56 4d 32 20 78 5b 35 41 25 72 > > L V M 2 > > > > > > > >I find what appears to be an LVM2 vgconfig block starting at 0x01200, > >extracted that to a file and was able to read the UUID that this PV > >should have. It is one of about a dozen that make up this VG. > > > > > >On another machine, I dumped a PV partition, and find "LABLEONE" at > >0x200, with the same " LVM2 " at 0x01000. > > > >I was concerned that my dump was offset, but the comparison to the > >"good" one suggests that that isn't the problem, but just the missing > >"LABLEONE" and related information at 0x0200. > > > > > >How to fix? > > > >If I do a "pvcreate --uuid xxxx" would this fix that recovered partition > >so that pvscan and friends can work properly, and I can finally boot > >that machine? > > Hi > > It's quite important to be aware how the disk corruption happened. > Was this plain disk hw error - or some crash of raid setup ? > > Normally you could restore PV with this: > > pvcreate --uuid XXXX --restorefile file_with_vg_backup /dev/ddddd > vgcfgrestore --restorefile file_with_vg_backup vgname > > > But if the content of device was scramble by some 'raid' bug - you might > have problem to retrieve any usable data afterward. > > > Regards > > Zdenek > _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/