Hmmmm, this means one needs at least 2 SQL and 2 File servers, so there is
redundancy (and cost!) in those.
The best method (modest cost and highest uptime) I can envision would be to
have 2 duplicate machines and a switch over mechanism that puts the second
server online when the first fails. Just need to tools to perform the
switchover and the duplication of the files and data from the primary
machine to the secondary. This means only one 'backup' email machine and
some software to keep them synchronized. Seems that this would be a less
expensive and less hardware intensive technique than Rick's.
Rick's method might be better for a system that already uses SQL and maybe a
larger system, so it does have a place in this world. But for a smaller
email system and less backup costs, I think my way may have some advantages.
Using your existing S&F server, the total downtime would be the time it
takes you to construct a new mail computer, install software and data files.
I've done this in as little as 2 hours (1:50 was in copying the data!) for a
modest sized server. If you already have the computer built and it has
copies of your \imail folders and files, the time would be reduced to
something like 10 minutes or so ( changing the IP/hostname, installing IMail
and copying the registry). If your boss can live with that, then you need
just the hardware and daily backup of your user data to the backup email
machine. The second machine could actually serve 2 purposes!
Daniel Donnelly
________________________________________________________
----- Original Message -----
From: "Rick Marei" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, March 14, 2001 5:38 PM
Subject: AW: [IMail Forum] Redundant Send and Receive
> Hi,
>
> to guarantee imail 100% uptime for a large number of users , here is how
to
> do it
>
> 2 imail servers authenticating against 1 clustered SQL Server and mails
> should be stored in 1 clustered file server to store emails, if this is
too
> much for you, just use RAID 5 or 10 for storing the mailboxes and also for
> SQL
>
> the mail files could be moved easily to a new box and the forwarding
> information are stored in plain text files in the mailboxes respectively
>
> for further details, please contact me
>
> Rick Marei
> i factory.at Internet Services GmbH
> Ferdinand Frey Weg 36
> A-1140 Wien
> Tel: +43 1 577 35 35
> Mobil: +43 676 95 666 11
>
> -----Ursprüngliche Nachricht-----
> Von: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]Im Auftrag von Yuri Levenfeld
> Gesendet: Mittwoch, 14. März 2001 14:21
> An: [EMAIL PROTECTED]
> Betreff: Re: [IMail Forum] Redundant Send and Receive
>
>
> clustering mail server
>
> ----- Original Message -----
> From: Stephen LaBuda
> To: [EMAIL PROTECTED]
> Sent: Tuesday, March 13, 2001 1:08 PM
> Subject: [IMail Forum] Redundant Send and Receive
>
>
> Ok All, I am looking to implement some kind of redundancy for my mail
> service. Granted I already have a store and forward box but this doesn't
> seem to meet the needs of the "boss" .. He wants 0 downtime or near zero
as
> possible for both sending and receiving mail for our service.
>
> Any suggestions on going about this?
>
> Thank You
>
> Stephen
>
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