On Tue, 2008-06-24 at 11:44 +0100, Ed W wrote: > Raphael Bittencourt S. Costa wrote: > > Ehlo all, > > > > I've been working on a migration of about 240K users from one server > > with qmail, courier imap, maildrop and ldap to postfix, dovecot, lda > > +sieve. Before the migration the server and the storage were always on > > high load. > > > > > > It almost doesn't seem enough of a drop...!
Really? The load of the qmail server were always on 120, but if something happens, like suddenly increase of mail deliver the server load jumps to 800. With postfix+dovecot the highest load I got was 35. > Have you benchmarked the > various apps a little? No, only dovecotxCourier. > Postfix syncs disks like crazy to prevent mail > loss in case of disaster Postfix queue is on local disk, and iostat only shows 6% of utilization. > - can I assume you have given some thought to > tuning your file system which handles the spool files? > The server uses xfs for maildir partition and so on, it uses noatime,nodiratime,nobarrier,logbufs=8. > Good luck > > Ed W
