There is a product called Double Take from NSI software that does this
type of thing well. I have not used it with imail, but have with SQL
without problems. It handles the file sync, and IP switchover, I am
not sure if it does the registry changes that would be needed.
www.nsisw.com for more info.
Regards,
Steve
DD> Hmmmm, this means one needs at least 2 SQL and 2 File servers, so there is
DD> redundancy (and cost!) in those.
DD> The best method (modest cost and highest uptime) I can envision would be to
DD> have 2 duplicate machines and a switch over mechanism that puts the second
DD> server online when the first fails. Just need to tools to perform the
DD> switchover and the duplication of the files and data from the primary
DD> machine to the secondary. This means only one 'backup' email machine and
DD> some software to keep them synchronized. Seems that this would be a less
DD> expensive and less hardware intensive technique than Rick's.
DD> Rick's method might be better for a system that already uses SQL and maybe a
DD> larger system, so it does have a place in this world. But for a smaller
DD> email system and less backup costs, I think my way may have some advantages.
DD> Using your existing S&F server, the total downtime would be the time it
DD> takes you to construct a new mail computer, install software and data files.
DD> I've done this in as little as 2 hours (1:50 was in copying the data!) for a
DD> modest sized server. If you already have the computer built and it has
DD> copies of your \imail folders and files, the time would be reduced to
DD> something like 10 minutes or so ( changing the IP/hostname, installing IMail
DD> and copying the registry). If your boss can live with that, then you need
DD> just the hardware and daily backup of your user data to the backup email
DD> machine. The second machine could actually serve 2 purposes!
DD> Daniel Donnelly
DD> ________________________________________________________
DD> ----- Original Message -----
DD> From: "Rick Marei" <[EMAIL PROTECTED]>
DD> To: <[EMAIL PROTECTED]>
DD> Sent: Wednesday, March 14, 2001 5:38 PM
DD> Subject: AW: [IMail Forum] Redundant Send and Receive
>> Hi,
>>
>> to guarantee imail 100% uptime for a large number of users , here is how
DD> 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
DD> 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
DD> as
>> possible for both sending and receiving mail for our service.
>>
>> Any suggestions on going about this?
>>
>> Thank You
>>
>> Stephen
>>
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