What kind of propogation delays do you
see in the 'real time' replication to the rest of a cluster?
We only use two servers, a primary and a backup. The replication is pretty
much instant.
Seconds,
minutes, hours? Does the software go as far as to replicate things like
the application of NT service packs?
No way. I don't think that anything does that real-time. You would have to
replicate the registry doing that and that's dangerous to trust any software
app with this responsibility. One time the people at Sunbelt software sent
me a beta called registry mirror--or something like that--but...a beta, I
don't think so.
You mention failover and in a
quick look at the product site they mention 'failover technologies', but
it's not clear if that's somehow part of the product or if we're simply
talking about use of the software in conjunction with other clustering
solutions.
Yes, Double-Take has a failover module. Works great. I wrote a review of the
process as it applies to a Web server, it's at:
http://www.fusionauthority.com/alert/index.cfm?alertid=14#Rev1
John Cesta
http://www.cybersmarts.net
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ColdFusion ASP and ActiveState PERL Hosting
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SearchIt PRO - IIS Logfile Management Software
www.serverautomationtools.com
-----Original Message-----
From: Jim McAtee [mailto:[EMAIL PROTECTED]]
Sent: Saturday, September 09, 2000 1:25 PM
To: [EMAIL PROTECTED]
Subject: Re: CF Clustering
John,
That looks interesting, thanks. What kind of propogation delays do you
see in the 'real time' replication to the rest of a cluster? Seconds,
minutes, hours? Does the software go as far as to replicate things like
the application of NT service packs? You mention failover and in a
quick look at the product site they mention 'failover technologies', but
it's not clear if that's somehow part of the product or if we're simply
talking about use of the software in conjunction with other clustering
solutions.
Jim
-----Original Message-----
From: John Cesta - Lists <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Friday, September 08, 2000 6:24 PM
Subject: RE: CF Clustering
>We use Double Take for mirroring/replication and failover. Works with
SQL
>etc. For us, it's a fantastic product!
>
>www.nsisoftware.com
>
>John Cesta
>
>http://www.cybersmarts.net
>-------------------------------------------------
>ColdFusion ASP and ActiveState PERL Hosting
>--------------------------------------------
>SearchIt PRO - IIS Logfile Management Software
>www.serverautomationtools.com
>
>
>-----Original Message-----
>From: Ann Marie Thurmond [mailto:[EMAIL PROTECTED]]
>Sent: Friday, September 08, 2000 8:10 PM
>To: [EMAIL PROTECTED]
>Subject: RE: CF Clustering
>
>
>If you look on the Allaire web site, you will find lots of information
>regarding clustering.
>
>We also wanted to use clusering for load balancing and failover, but we
>didn't want to have to manually copy updated files into two places. I
read
>somewhere on the Allaire site that when ClusterCats was owned by Bright
>Tiger, they had a replication solution, but it wasn't included in the
>version of ClusterCats that ships with CF Enterprise (you had to
purchase an
>upgrade from Bright Tiger). But after Allaire bought Bright Tiger,
mention
>of that feature disappeared.
>
>Anyway, I called Allaire yesterday to find out what they suggest for
>replication and the rep is supposed to call me back. Let me know if
you're
>interested and I will pass along his answer.
>
>-----Original Message-----
>From: Jim McAtee [mailto:[EMAIL PROTECTED]]
>Sent: Friday, September 08, 2000 4:41 PM
>To: [EMAIL PROTECTED]
>Subject: CF Clustering
>
>
>Does anyone have a link or pointer to information regarding how to
>cluster CF web servers? We're looking to upgrade our web and database
>servers and I'd like to hear about the various approaches taken to
>clustering CF web servers.
>
>Ideally, I'd like to achieve load-balancing and failover via
redundancy.
>For our purposes the load-balancing doesn't have to be perfect, but the
>failover must be automatic and transparent. I'm assuming we'd run
>several redundant web/CF servers connected to a common MS SQL server.
>For the time being, I don't think we'd run a common fileserver for the
>web site templates or other static content. Files would need to be
>replicated on all servers.
>
>With this configuration, I was wondering about things like the best way
>to (1) achieve the load balancing (hardware and/or software needs?),
>considering that CF sessions need to be maintained (2) a good means of
>replicating content accross servers (3) other considerations?
>
>Thanks for any input,
>Jim
>
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