Adam Tauno Williams <adam@xxxxxxxxxxxxxxxx> wrote: > If you have allot of users and allot of mail you are going to have allot > of I/O. No way around that, regardless of the server. Cyrus' indexes > headers better now, so that might help. But you still need adequate > through-put. I've found that /var/lib/imap (meta-data) needs fast I/O > but /var/spool/imap (message store) doesn't due too bad tossed onto a > SAN or slower disks. That depends how many mails per second you will have to deliver. Normally you are right, the meta partition is heavy random i/o. With high mail receiving rates you need a fast write storage for your imap spool as well. Filesystems like ZFS which write their contents nearly sequentially are ideal for this kind of work. And: Use a 64bit system and add much RAM. Your OS will (hopefully) cache all metadata which is heavily used in RAM. We are having 98% hits on our meta partition. ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
