[Dovecot] reason to switch to 1.1

[Cor Bosman]

> >  This specific server is a dual core 2.8ghz xeon with hyperthreading
> >  running on FreeBSD 6.2-STABLE. We have over 1 million mailboxes, with about
> >  75,000 daily active users. At peak maybe 20,000 concurrent, in a mix of
> >  webmail and direct imap.  (no POP, thats handled by different software).
> >
> >  The backend is a NetAPP 6070 with about 170 harddisks. All mail and
> >  control files are on this netapp, but all indexes are on local disks, and
> >  we try and make sure customers end up on the same imap server every time.
> >  As soon as all servers are 1.1 I'll start experimenting with NFS indexes.
> >
> 
> Just in case I understand you wrong: You're serving 20k concurrent
> users with 1 (one) server?
> 
> What mailbox backend are you using? maildir?

Actually..it's 2 NetApp 6070s. But those are not just simple servers.
They are very expensive, dedicated NFS boxes each taking up a full rack
doing multiple terrabytes each, connected with multiple gbit links.

It's 99.99% maildir, with a very small hidden mbox legacy namespace.

Cor