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List:       qmail
Subject:    Re: clustered qmail  solution
From:       "Sean C Truman" <sean.truman () prodigysolutions ! com>
Date:       2000-08-31 19:00:58
[Download RAW message or body]

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
sean.truman@prodigysolutions.com



----- Original Message -----
From: Dave Sill <de5@sws5.ctd.ornl.gov>
To: <qmail@list.cr.yp.to>
Sent: Thursday, August 31, 2000 11:18 AM
Subject: Re: clustered qmail solution


> reach_prashant@zeenext.com 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

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