Len ,
I believe in your opinion , but sometimes your client have some $$$ which he
want to give to you ;-)
Thanks all for your replies I'll investigate it .
Thanks again,
Waleed
----- Original Message -----
From: "Len Conrad" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, January 02, 2001 7:24 PM
Subject: Re: [IMail Forum] Load balancing
>
> >I want to ask if imail 6 support Load balancing or just clustering.
> >If it support load balancing , how can I implement that .
> >Plz help ASAP while I must decide to build a new system.
>
> Waleed,
>
> If you are interested in load balancing or clustering, I assume you
> are planning for either a BIG load (100' of 1000's of msgs) and/or
> fail-over reliability.
>
> In either case, I suggest you not approach the pb thinking "1 Imail
> box is great, 5 identical Imail boxes are greater".
>
> Rather, divide the total pb into functional boxes with an eye to the
> mail protocols and how to allot them to non-identical, "assymmetric"
boxes.
>
> Mailbox server + web mail server + pop3 server + SMTP AUTH are, in
> Imail6, indivisibly required to be on one Imail box.
>
> The only load-sharing Imail supports natively is Imail's proprietary
> peering for distributing incoming mail for a domain over 2 or more
> Imail boxes that share (not duplicate) the mail accounts/mailbox
> storage. And each peer server has its own private user base, it does
> not share a single external user base. Each Imail user will have to
> know which Imail server holds his account + mailbox and use that info
> to set up his POP3 server and SMTP (AUTH) outbound server. ie, each
> Imail server is independent of the other Imail servers, they don't
> share a total single load accounts base, the each have their own,
> separate account database.
>
> For webmail, there is some relief to the above, by using HTTP
> redirection, another project unto itself.
>
> If you are going apply non-Imail, external load balancing to Imail
> then you can't slice a box any smaller than the above group of functions.
>
> However, to offload the chores for receiving/sending mail to
> Internet, I recommend dedicated SMTP gateways such as 2 or more
> IMGate boxes, which themselves are failover due to SMTP MX redundancy
> for incoming mail. Having such a larger user base and mail system,
> you'll be a big, fat target for spammers. IMGate will handle that.
>
> For the user database(s, I emphacie plural, again), I recommend an
> external SQL RAID box since you will probably need access to the user
> bases by other applications such as accounting.
>
> That's the big picture as I see it for Imail6. For the fine strokes
> and actually making it all work, well, hmmm, $$$$$. :))))
>
> You will also need at least 2 DNS machines (again Imail server only
> supports one so no failover) to support the IMGate machines for DNS
> lookups to send mail. Imail won't be using DNS at all.
>
> For list services for high volumes, I'd forget about Imail basic
> lists and go with www.Listar.org on www.postfix.org on a FreeBSD or Linux
box.
>
> Good luck,
> Len
>
>
>
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> http://IMGate.MEIway.com : Build free, hi-perf, anti-spam mail gateways
>
>
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