LALOT Dominique wrote: > Hello, > > We are using cyrus-imap for a long time. Our architecture is a SAN from EMC > and thanks to our "DELL support" we are obliged to install redhat. The only > option we have is to use ext3fs on rather old kernels. We have 4000 accounts > for staff and 20000 for students > The system is rather fast and reliable. BUT.. > We support ~8000 faculty and staff and ~45000 students. On 16x 250G reiserfs 'partitions' from and EMC CX500 arrays. Reiserfs has proven to handle the load much better than ext3 (which we tested... it was a disaster). We've been using reiserfs since RedHat Linux 7.x. We also tested an early xfs patchset... but it was prone to corruption (but that was years ago). > Once, there was a bad shutdown corrupting ext3fs and we spent 6 hours on an > fsck. > Next we discovered that our backup system was going slower and slower. We > just pointed out that it was due to fragmentation, and guess what, there's > no online defrag tool for ext3. We've only had to reiserfsck a partition once (with --rebuild-tree eek!). It took a while, but the data was intact... it beats restoring from tape. We don't defragment (as such). In an attempt to speed up overnight backups we once did a scripted rename of mailboxes to spare partitions. Since this time we have given up on filesystem based backup and simply do a block-level backup in combination with partition snapshots. Keeping the cyrus partition size low has limited many of our problems and we do a scripted rename of mailboxes to balance partition utilization when we add another partition. Bron and the fastmail guys could tell you more about reiserfs... we've used RH&SuSE/reiserfs/EMC for quite a while and we are very happy. Except those loony folks who want Exchange... Shawn -- Shawn Nock (OpenPGP: 0xFF7D08A3) Unix Systems Group; UITS University of Arizona nock at email.arizona.edu
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