So what's the underlying disk subsystem for the queue then? Hopefully you've some super-duper RAID10 or something with a 1/2 decent filesystem there?
What about round-robin DNS for load balancing across many incoming machine?
--
Martin Hepworth
Snr Systems Administrator
Solid State Logic
Tel: +44 (0)1865 842300
> -----Original Message-----
> From: exim-users-bounces@???
> [mailto:exim-users-bounces@exim.org] On Behalf Of Marc Perkel
> Sent: 02 July 2008 17:34
> To: exim-user
> Subject: Re: [exim] Should queue processing be rewritten in Exim?
>
>
>
> Peter Bowyer wrote:
> > On 02/07/2008, Marc Perkel <marc@???> wrote:
> >
> >> Suppose Exim had 2 queues instead of one. We'll call the
> first queue
> >> the primary queue which is a ram drive and the secondary
> queue which
> >> is a disk drive. All this is of course optional and user settable.
> >>
> >
> > You're proposing a solution before defining the
> requirements. What's
> > the high-level use case here?
> >
> > Peter
> >
> >
> Hi Peter,
>
> I'll use myself as an example. I am in the front end spam
> filtering business. (http://www.junkemailfilter.com) I have
> about 4000 domains pointed to a single Exim server. Email
> comes in - I filter it - and I send the good email on to the
> customer's existing server. This machine is running Exim
> only. Spamassassin is running on a several other computers as
> well as MySQL and caching DNS servers. This one box, which is
> the box most everything hits first is all Exim. I have
> several other Exim servers on the next level of MX for backup
> and overload handling.
>
> Additionally I have a a spam out channel where spam is
> forwarded to another server and is delivered to several other
> places that process my spam. It goes off to spam blocking
> companies for mining and to URIBL list processors to feed
> their block lists. These messages are very low priority and
> if they are lost or rejected there is no loss.
>
>
> Most email hits this server and if it's good is instantly
> relayed to the customer's server for delivery. Most spam is
> forwarded to my spam processing server and if it fails it's
> deleted. No retry on spam. If the customer's server is down
> or overloaded and I get a 4xx error on delivery the message
> is transferred to a retry server which will attempt to
> deliver the message for 4 days. So the idea of this main exim
> server is not to hold anything in it's own queue. Whatever
> comes in goes somewhere because it is the fast bulk processor.
>
> The bottleneck is the queue and I've noticed that if I use a
> ram disk for the queue that I can process many times as much
> mail with var lower load levels that using disk based queue.
> Ideally if I had a battery back up ram disk card that would
> be ideal but I can't find that anywhere.
>
> So - that's the problem I wish to solve.
>
>
> --
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> ## Exim details at http://www.exim.org/
> ## Please use the Wiki with this list - http://wiki.exim.org/
>
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