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