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 BBB3AC433F5 for ; Mon, 18 Oct 2021 03:02:37 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) (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 B19B661050 for ; Mon, 18 Oct 2021 03:02:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org B19B661050 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bdmcc-us.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-377-UGSpfWSZOfaVv8azNfi0Fw-1; Sun, 17 Oct 2021 23:02:32 -0400 X-MC-Unique: UGSpfWSZOfaVv8azNfi0Fw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A5340100F944; Mon, 18 Oct 2021 03:02:24 +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 1CD7E60657; Mon, 18 Oct 2021 03:02:22 +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 A6EEF4A703; Mon, 18 Oct 2021 03:02:00 +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 19I31t2O024530 for ; Sun, 17 Oct 2021 23:01:55 -0400 Received: by smtp.corp.redhat.com (Postfix) id 927C62166B26; Mon, 18 Oct 2021 03:01:55 +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 8D23E2166B25 for ; Mon, 18 Oct 2021 03:01:52 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [205.139.110.120]) (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 CE2CB899EC1 for ; Mon, 18 Oct 2021 03:01:52 +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-390-6Mz7Jd0mPRmiiOLsgfJN3Q-1; Sun, 17 Oct 2021 23:01:50 -0400 X-MC-Unique: 6Mz7Jd0mPRmiiOLsgfJN3Q-1 Received: from [69.133.187.32] (helo=buadh-brath.com) by friday.buadh-brath.com with esmtp (Exim 4.89) (envelope-from ) id 1mcIDV-0003zp-6N for linux-lvm@redhat.com; Mon, 18 Oct 2021 02:17:33 +0000 Received: by buadh-brath.com (Postfix, from userid 1000) id 3D75E201C0; Sun, 17 Oct 2021 22:17:19 -0400 (EDT) Date: Sun, 17 Oct 2021 22:17:19 -0400 From: Brian McCullough To: LVM general discussion and development Message-ID: <20211018021719.GA16936@bdmcc-us.com> MIME-Version: 1.0 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 Subject: [linux-lvm] Recovering "broken" disk ( 17th ) 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 2.79 on 10.5.11.11 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 Folks, I have had a disk go bad on me, causing me to lose one PV. I seem to have retrieved the partition using ddrescue, but it also seems to be missing some label information, because pvscan doesn't see it. Using hexdump, I see the string " LVM2 " at 0x1004, but nothing before that. The whole phrase is: 0x01000 16 d6 8e db 20 4c 56 4d 32 20 78 5b 35 41 25 72 I find what appears to be an LVM2 configuration section at 0x1200, and so I was able to read the UUID that this PV should have. 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. 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? Thank you, Brian _______________________________________________ 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/