From: Jeremy Sanders Subject: Re: fsck.ext4: Group descriptors look bad... trying backup blocks... Date: Fri, 17 Apr 2009 19:51:21 +0100 (BST) Message-ID: References: <20090417115659.GB7117@mit.edu> <49E8B7F4.6020608@redhat.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: linux-ext4@vger.kernel.org To: Eric Sandeen Return-path: Received: from ppsw-6.csi.cam.ac.uk ([131.111.8.136]:57737 "EHLO ppsw-6.csi.cam.ac.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751425AbZDQTOf (ORCPT ); Fri, 17 Apr 2009 15:14:35 -0400 In-Reply-To: <49E8B7F4.6020608@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Fri, 17 Apr 2009, Eric Sandeen wrote: > Jeremy Sanders wrote: >> Theodore Tso wrote: > > ... > >>> I see from the dumpe2fs that you sent it had only been in use for a >>> week. How were you using the filesystem? Did you try using the >>> online resize feature at any time? >> >> No. The filesystem was used to store rsync snapshots of other file systems >> (using the hard link feature). I had only rsynced the initial data and run a >> couple of rsync backups on to it. The filesystem was created using: >> >> mkfs.ext4 -m0 -b 4096 -E stride=8,stripe-width=72 /dev/md0 > > Can you show us exactly how you're using rsync? is this with > rdiff-backup or some similar tool? No, plain rsync. We have a script which does something like rsync -raHSx --stats --while-file --numeric-ids \ --link-dest=/mnt/username/20090418/ host:/data/username/ \ /mnt/username/20090419/ for a set of users. This command copies the files from /data/username on host to /mnt/username/20090419, but creates hard links to the previous copy (/mnt/username/20090418/) for unchanged files. It worked fine on ext3, at least for a 2.4TB device. Jeremy -- Jeremy Sanders http://www-xray.ast.cam.ac.uk/~jss/ X-Ray Group, Institute of Astronomy, University of Cambridge, UK. Public Key Server PGP Key ID: E1AAE053