From: Eric Sandeen Subject: Re: Issue with bad file system Date: Mon, 19 Nov 2012 09:18:01 -0600 Message-ID: <50AA4DA9.5090602@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: linux-ext4@vger.kernel.org To: Drew Reusser Return-path: Received: from mx1.redhat.com ([209.132.183.28]:43193 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752949Ab2KSPSC (ORCPT ); Mon, 19 Nov 2012 10:18:02 -0500 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: On 11/18/12 10:46 PM, Drew Reusser wrote: > Hello all, > > I am having an issue with a ext4 file system which I cannot get to > come back up. There were no changes that I know of, but I rebooted, > and when the system came back up it was not able to read from the hard > drives. I have it setup in a raid 10 configuration, and can mount the > raid array with no issues. However when I mount the file system, I > get the following error "EXT4-fs (md0): VFS: Can't find ext4 > filesystem" from the log files. > > Is there anyone that can help as I have to get this data back and I > prefer not to have to go to a professional to get it back and spend > the money. > > -Drew > > Basic Info: 4x1TB disks, raid 10 equaling 2TB total. All four disks > are just one giant partition starting at the 2MB mark so I could boot > and put mdadm in the boot sector and get into linux. > > Some basic commands below: > > > mint mnt # mount -t ext4 /dev/md0 /mnt/raid > mount: wrong fs type, bad option, bad superblock on /dev/md0, > missing codepage or helper program, or other error > In some cases useful info is found in syslog - try > dmesg | tail or so > Ok, at this point you need to do what it says: # dmesg | tail so we can see for ourselves why the kernel rejected it (is there anything other than "EXT4-fs (md0): VFS: Can't find ext4 filesystem" ? does /proc/mdstat look right? This is more likely an md config issue than an ext4 problem. What does file -s /dev/md0 or blkid /dev/md0 say? -Eric > > > C is the pen-drive I am booting from currently and F is the 2TB disk I > was using to backup to. > > mint dev # cat /proc/partitions > major minor #blocks name > > 7 0 939820 loop0 > 8 0 976762584 sda > 8 1 976760832 sda1 > 8 16 976762584 sdb > 8 17 976237568 sdb1 > 8 32 1985024 sdc > 8 33 1984960 sdc1 > 8 48 976762584 sdd > 8 49 976760832 sdd1 > 8 64 976762584 sde > 8 65 976237568 sde1 > 11 0 1048575 sr0 > 8 80 1953514584 sdf > 8 81 1953512448 sdf1 > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >