If the load is that large it would probably justify a hardware or dedicated
software load-balancing solution. Doesn't Red hat appears to have an
"active" load balancing solution:
http://www.redhat.com/docs/manuals/advserver/RHLAS-2.1-Manual/install-guide/
s1-lvs-scheduling.html
http://makeashorterlink.com/?B31852682

Hardware wise, you could probably pick up a couple Cisco local redirector at
auction. I assume this stuff is important and you need redundancy and
failover.

This is certainly not an issue to dedicate SA gurus against. It's been done,
why re-invent the wheel?

-----Original Message-----
From: Rich Puhek [mailto:[EMAIL PROTECTED]] 
Sent: Thursday, November 21, 2002 1:17 PM
To: Justin Mason
Cc: Ralf Hildebrandt; Mark M; [EMAIL PROTECTED]
Subject: Re: [SAtalk] Distribute the load


True, spamd doesn't need much for state info, and each connection is 
independent of other connections.

I was thinking along the lines of spamc trying to do the load-ballancing 
by determining which server out of a list it should contact, as opposed 
to having multiple IP addresses for an A-record. If spamc was chosing 
which of a list of servers it should contact, it would either have to 
pick randomly, or would have to have some way of "remembering" which 
server(s) had been picked in the past.

Mostly thinking aloud. The round-robin DNS solution appears to be the 
best bet. Doesn't seem to be much advantage in having spamc handle the 
ballancing act.

--Rich



Justin Mason wrote:
> Rich Puhek said:
> 
>>The conceptual problem with doing round-robin spamd servers is that 
>>the
>>mail server itself would have to maintain some state info to determine 
>>which spamd server it shoud contact (unless it randomly selected one). 
>>Given most implementations (procmail for lots of us), maintaining state 
>>info from one mail message to another would be tricky.
> 
> 
> spamd needs very little state, apart from user preferences.
> 
> Using a round-robin DNS A record, and NFS-mounted user dirs or an SQL 
> database, this is pretty trivial, and is std practice for most big 
> SpamAssassin-using sites ;)
> 
> --j.
> 


-- 

_________________________________________________________

Rich Puhek
ETN Systems Inc.
2125 1st Ave East
Hibbing MN 55746

tel:   218.262.1130
email: [EMAIL PROTECTED]
_________________________________________________________



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