I recommend Legato for it. Works very well and two servers are completely
synchronized all the time although one Ipswitch license is enough to
maintain it because Imail technically doesn't exist on the second server
until first server dies.
I tried in real time, second server became operational in 20 seconds after
the first one crashed, and it also inherited IP address from the failed
server.
----- Original Message -----
From: "Daniel Donnelly" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, March 15, 2001 11:45 AM
Subject: Re: [IMail Forum] Redundant Send and Receive
> 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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