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.
Before migration: Storage IOPs = 4600 Read average = 2800 Write average = 1800 Storage CPU (Raid5) Crl0 = 50% Crl1 = 50% Server Load = 120 %user = 35 %system = 60 %iowait = 5 %idle = 0 After migration: Storage IOPs = 3000 Read average = 1200 Write average = 1800 Storage CPU (Raid5) Crl0 = 40% Crl1 = 40% Server Load = 25 %user = 10 %system = 27 %iowait = 40 %idle = 23 And now the server responds so quickly to any imap command. Dovecot is now the default imap/pop server here, Thanks Timo. []s, Raphael Costa
