PS I know some people say XFS, JFS etc are brilliant but my local experience is that although they may be faster in Linux 2.4, they are more prone to corruption.. (haven't tried either in the last 6 months tho')
As for XFS, I never had any problems with it (Version 1.2.0). We are running a 600 GB Mailspool with it. I would call it reliable.
Pascal
