From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx15.extmail.prod.ext.phx2.redhat.com [10.5.110.20]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s3HAM5ei015771 for ; Thu, 17 Apr 2014 06:22:05 -0400 Received: from smtp4-g21.free.fr (smtp4-g21.free.fr [212.27.42.4]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s3HAM3mA003139 for ; Thu, 17 Apr 2014 06:22:03 -0400 Received: from gateway.linuxnetwork.fr (unknown [82.241.253.92]) by smtp4-g21.free.fr (Postfix) with ESMTP id A14904C8062 for ; Thu, 17 Apr 2014 12:21:57 +0200 (CEST) Received: from netstation (netstation.linuxnetwork.fr [192.168.0.1]) by gateway.linuxnetwork.fr (Postfix) with ESMTP id EB68834E61 for ; Thu, 17 Apr 2014 12:22:01 +0200 (CEST) Date: Thu, 17 Apr 2014 12:23:15 +0200 From: "L.M.J" Message-ID: <20140417122315.4c3687ea@netstation> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [linux-lvm] LVM issues after replacing linux mdadm RAID5 drive 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; charset="us-ascii" To: linux-lvm@redhat.com Hi, For the third time, I had to change a failed drive from my home linux RAID5 box. Previous time went right and this time, I don't know what I did wrong, but I broke my RAID5. Well, at least, he won't start. /dev/sdb was the failed drive /dev/sdc and /dev/sdd are OK. I tried to reassamble the RAID with this command after I replace sdb and create a new partition : ~# mdadm -Cv /dev/md0 --assume-clean --level=5 --raid-devices=3 /dev/sdc1 /dev/sdd1 /dev/sdb1 Well, I gues I did a mistake here, I should have done this instead : ~# mdadm -Cv /dev/md0 --assume-clean --level=5 --raid-devices=3 /dev/sdc1 /dev/sdd1 missing Maybe this wipe out my data... Let's go futher, then, pvdisplay, pvscan, vgdisplay returns empty information :-( Google helped me, and I did this : ~# dd if=/dev/md0 bs=512 count=255 skip=1 of=/tmp/md0.txt [..] physical_volumes { pv0 { id = "5DZit9-6o5V-a1vu-1D1q-fnc0-syEj-kVwAnW" device = "/dev/md0" status = ["ALLOCATABLE"] flags = [] dev_size = 7814047360 pe_start = 384 pe_count = 953863 } } logical_volumes { lvdata { id = "JiwAjc-qkvI-58Ru-RO8n-r63Z-ll3E-SJazO7" status = ["READ", "WRITE", "VISIBLE"] flags = [] segment_count = 1 [..] Since I saw lvm information, I guess I haven't lost all information yet... I tried an unhoped command : ~# pvcreate --uuid "5DZit9-6o5V-a1vu-1D1q-fnc0-syEj-kVwAnW" --restorefile /etc/lvm/archive/lvm-raid_00302.vg /dev/md0 Then, ~# vgcfgrestore lvm-raid ~# lvs -a -o +devices LV VG Attr LSize Origin Snap% Move Log Copy% Convert Devices lvdata lvm-raid -wi-a- 450,00g /dev/md0(148480) lvmp lvm-raid -wi-a- 80,00g /dev/md0(263680) Then : ~# lvchange -ay /dev/lvm-raid/lv* I was quite happy until now. Problem appears now when I try to mount those 2 LV (lvdata & lvmp) as ext4 partition : ~# mount /home/foo/RAID_mp/ ~# mount | grep -i mp /dev/mapper/lvm--raid-lvmp on /home/foo/RAID_mp type ext4 (rw) ~# df -h /home/foo/RAID_mp Filesystem Size Used Avail Use% Mounted on /dev/mapper/lvm--raid-lvmp 79G 61G 19G 77% /home/foo/RAID_mp Here is the big problem ~# ls -la /home/foo/RAID_mp total 0 Worst on the other LVM : ~# mount /home/foo/RAID_data mount: wrong fs type, bad option, bad superblock on /dev/mapper/lvm--raid-lvdata, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so I bet I recover the LVM structure but the data are wiped out, don't you think ? ~# fsck -n -v /dev/mapper/lvm--raid-lvdata fsck from util-linux-ng 2.17.2 e2fsck 1.41.11 (14-Mar-2010) fsck.ext4: Group descriptors look bad... trying backup blocks... fsck.ext4: Bad magic number in super-block when using the backup blocks fsck.ext4: going back to original superblock fsck.ext4: Device or resource busy while trying to open /dev/mapper/lvm--raid-lvdata Filesystem mounted or opened exclusively by another program? Any help is welcome if you have any idea how to rescue me pleassse ! -- LMJ "May the source be with you my young padawan"