On Thu, 2010-12-09 at 17:15 -0200, Henrique Fernandes wrote: > I am using postfix + dovecot 2.0.6 + mailman > > And others 2 serves with only postfix and dovecot writing at same storage > with OCFS2. > > We are having problens with IOwait, and still trying to figure out why that > is happen!
sdbox/mdbox format should reduce disk IO compared to maildir. > But, problem becomes much worse when some emails are used in mailman, when > it happens all 3 serves became really slow. iowait goes to 80. > > Does anyone have an idea how to slow down the dovecot lda ? By telling Postfix to limit the number of simultaneous dovecot-lda processes. In master.cf you have: # service type private unpriv chroot wakeup maxproc command + args So change the dovecot-lda entry's maxproc from "-" to however many simultaneous dovecot-ldas you want.
