I am having around 2000 users on my cyrus server ( redhat 9.0 ) someone told be I should reformat my partition in Reiserfs rather that
ext3 and I will get a great perlformance improvement
I noticed a significant performance improvement when moving from ext3 to reiserfs, and consider it well worth it. That said, reiserfs doesn't play especially well with LVM snapshots, so there's a significant downside. Some people swear by XFS - and it /does/ work brilliantly with LVM - but there have been reports of unreliability and FS corruption.
Craig Ringer
