Laurent Luyckx writes:
Hi,
I'm using courier-imap with exim for 2 months now. It work great, no problems
since now. I'm planning to use it for more than 500000 users. I will use it with
a Netapp cluster F760 with an (2 in fact for failover) Alteon LoadBalancer and
10 frontends (a mix of Sun and Clone PCs).
Does someone has experimented that already or I will be the first ?
I recall someone doing something like that, about a year ago. I forget who
it was.
The tricky things to look out for is that some so-called "load-balancing"
gadgets implement their idea of a "failover" by repeatedly connecting and
disconnecting to the IMAP server on each host. Often hundreds of times per
second(!) The claimed purpose was to be able to quickly switch the host
out if it goes down.
Since each connection and disconnection gets logged, your logs will quickly
fill up with this crap. You may need to make a rather simple patch to drop
logging of the initial connect and disconnect.
Also, it may take some trial and error to properly tune the maximum number
of accepted simultaneous connections. It's just a parameter in
imapd.config and imapd-ssl.config that will need to be tweaked according to
your estimates.
2 messages in net.sourceforge.lists.courier-users[courier-users] Re: Courier-imap + ex...
