Przemyslaw Wegrzyn wrote:
> I'm going to use qmail + courier imap/pop + maildrop, maildirs++ over NFS.
>
> I consider using qmail-ldap, but I've heard many things about OpenLDAP
> performace - both good and bad opinions.
>
> If every qmail-ldap server asks central ldap server on every delivery, I
> guess it can probably overload OpenLDAP server.
Well a mail server will have to consult some kind of database on every
delivery anyway, otherwise it won't know what to do with the mail.
LDAP servers are specifically designed to handle very high request
loads, as they are optimised for many-reads-few-rights. LDAP scales very
well - simply replicating the LDAP databases on each local machine will
ensure the system stays up and working.
As for it "overloading an OpenLDAP server", the only issue here is how
big your OpenLDAP machine is, and how many machines you got. If you
overload the server that's a RAM-and-processor problem, not an openldap
problem. If openldap turns out to be less than reliable, or it does not
suit your needs, install an alternative - like iPlanet Directory Server.
Having been involved with the design of a system that started at 1.4
million accounts and had to scale from there, scaling to these volumes
takes some careful planning at the outset.
Work out how everything is going to grow in advance - from having
multiple NFS servers, to multiple LDAP servers, to multiple mail servers
- and you will not have any surprises down the line.
Regards,
Graham
--
-----------------------------------------
[EMAIL PROTECTED] "There's a moon
over Bourbon Street
tonight..."
S/MIME Cryptographic Signature
