Re: Can we build a proper email cluster? (was: Re: Why is debian.org email so unreliable?)
On Wed, 13 Oct 2004 21:26, Wouter Verhelst <email@example.com> wrote:
> On Wed, Oct 13, 2004 at 01:05:26PM +1000, Russell Coker wrote:
> > On Wed, 13 Oct 2004 07:29, Henrique de Moraes Holschuh <firstname.lastname@example.org>
> > > The third is to not use LDAP for lookups, but rather cache them all in
> > > a local, exteremly fast DB (I hope we are already doing that!). That
> > > alone could get us a big speed increase on address resolution and
> > > rewriting, depending on how the MTA is configured.
> > I've run an ISP with more than 1,000,000 users with LDAP used for the
> > back-end.
> Yes, but that was probably with the LDAP servers and the mail servers
> being in the same data center, or at least with a local replication.
Yes. Local replication is not difficult to setup.
> This is not the case for Debian; and yes, we already do have local fast
> DB caches (using libnss-db).
That's an entirely different issue. libnss-db is just for faster access
to /etc/passwd. The implementation in Linux is fairly poor however, it
doesn't even stat /etc/passwd to see if it's newer than the db. The
performance gain isn't as good as you would expect either.
http://www.coker.com.au/selinux/ My NSA Security Enhanced Linux packages
http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/ Postal SMTP/POP benchmark
http://www.coker.com.au/~russell/ My home page
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