Or if you would like pictures..
LVS www.linuxvirtualserver.com
There are also a couple of companys offering clustering software..
1) turbolinux (But from my experience with the product & tech support I do
not recommend this.. use LVS). www.turbolinux.com
2) UnderStudy (which has ports for NT, FreeBSD, Linux & Solaris)
www.polyserv.com
Sean Truman
www.prodigysolutions.com
[EMAIL PROTECTED]
----- Original Message -----
From: Dave Sill <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, August 31, 2000 11:18 AM
Subject: Re: clustered qmail solution
> [EMAIL PROTECTED] wrote:
>
> > what does "clustered qmail solution " mean...
>
> It means "multiple systems acting as a single system". For example,
> "aol.com" is not a single, huge 25,000 horsepower server box that
> handles all of AOL's incoming mail. Instead, "aol.com" points to a
> list of mail exchangers (MX's), any of which will accept mail for
> addresses at aol.com. When AOL needs additional incoming SMTP
> capacity, they can either add new entries to their MX record, or they
> can upgrade existing systems. Since there are many of them, if one
> breaks or is down for upgrading or patching, their mail still works.
>
> It's also possible to cluster POP and IMAP servers, either with
> partitioned or shared responsibilities. E.g., you could have two POP
> servers: one for users whose names start with the letters A-M and
> another for those starting with N-Z. That spreads the load, but
> doesn't provide redundancy: if a server is down, some users are unable
> to access their mail. Alternatively, you can have multiple POP servers
> accessing a shared high-availability mail store like a
> network-attached RAID. The RAID is still a single-point-of-failure,
> but it's designed to minimize downtime. qmail's maildir format is
> especially well suited to storage on a network-attached RAID since it
> avoids messy locking problems.
>
> -Dave
