[Fwd: Re: Questions on a redundant mail system]
-------- Original Message --------
Subject: Re: Questions on a redundant mail system
Date: Mon, 20 Dec 1999 12:10:45 -0500 (EST)
From: Allen Ahoffman <ahoffman@announce.com>
To: e.bystrom@wineasy.se (Erik Byström)
Anybody used coda files system for things like this?
> Hey!
>
> We're about to re-design our mail system and are looking at various
> hardware and software options for failover, redundancy and load
> balancing. The solution I'd like to present consist of two or more
> frontend servers handling all incoming requests, then forwarding them
> to a number of backend servers depending on load.
>
> I have a few questions regarding the design which I'd like to have
> views on as some of you people around here have lots more experience
> on this.
>
> 1) Frontend: Which is better: two frontend servers, each handling both
> POP and SMTP connections together with DNS round-robin or separate
> machines for POP and SMTP? They would handle incoming SMTP and POP
> requests for about 15000-20000 people plus a lot of mailing from
> websites with forms and such. We're currently handling approx. 150 000
> POP requests each day and somewhere around 220 000 SMTP transfers.
>
> 2) Backend: Should one let the backend servers handle both POP/SMTP on
> the same machines, or have separate machines for each service?
> Pros/cons?
>
> 3) Backend: For redundancy purpose I want all servers to share the
> same storage area, so if one backend server server goes down the
> others will still be able to handle delivery to/from all mailboxes.
> How do we solve this best? Some kind of NFS mounts, a hardware RAID
> array, AFS? I think this is the most important question.
>
> I've followed the Huge Email Service thread and found it very
> interesting. The Jetcafe papers helped some, but it was _too_
> large-scale and I'd like up-to-date info on filesystems and hardware
> as well.
>
>
> Thanks,
>
> /erik.
>
>
> --
> To UNSUBSCRIBE, email to debian-isp-request@lists.debian.org
> with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
>
Reply to: