Subject: Re: Desktop Filesystem Benchmarks in 2.6.3
From: Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
To: Robin Rosenberg <robin.rosenberg.lists@dewire.com>
Cc: David Weinehall <david@southpole.se>, Andrew Ho <andrewho@animezone.org>,
       Dax Kelson <dax@gurulabs.com>, Peter Nelson <pnelson@andrew.cmu.edu>,
       Hans Reiser <reiser@namesys.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       ext2-devel@lists.sourceforge.net, ext3-users@redhat.com,
       jfs-discussion@www-124.southbury.usf.ibm.com, reiserfs-list@namesys.com,
       linux-xfs@oss.sgi.com
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Date: Wed, 03 Mar 2004 11:19:01 +0100
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On Wed, 2004-03-03 at 10:59, Robin Rosenberg wrote:
> On Wednesday 03 March 2004 10:43, Felipe Alfaro Solana wrote:
> > But XFS easily breaks down due to media defects. Once ago I used XFS,
> > but I lost all data on one of my volumes due to a bad block on my hard
> > disk. XFS was unable to recover from the error, and the XFS recovery
> > tools were unable to deal with the error.
> 
> What file systems work on defect media? 

It's not a matter of working: it's a matter of recovering. A bad disk
block could potentially destroy a file or a directory, but shouldn't
make a filesystem not mountable nor recoverable.

> As for crashed disks I rarely bothered trying to "fix" them anymore. I save
> what I can and restore what's backed up and recovery tools (other than
> the undo-delete ones) usually destroy what's left, but that's not unique to
> XFS. Depending on how good my backups are I sometimes try the recovery
> tools just to see, but that has never helped so far.

The problem is that I couldn't save anything: the XFS volume refused to
mount and the XFS recovery tools refused to fix anything. It was just a
single disk bad block. For example in ext2/3 critical parts are
replicated several times over the volume, so there's minimal chance of
being unable to mount the volume and recover important files.

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