Re: Redundancy & Fault Tolerance

Mike Stankavich ( (no email) )
Sat, 11 Jul 1998 10:57:10 -0700


I tried Octopus by Qualix Technologies ( but I
wasn't impressed. It stopped replicating a lot and would then fill up the
hard disk with the replication log. Also you can fail over a maximum of 25
IP addresses. Doesn't do much good when you are running 60 virtual domains
that each have an IP address. Vinca has a solution that looks pretty good
(, but I haven't tried it. I'd love to hear from
anybody that has. Then there's Microsoft Cluster Server which looks harder
to implement & a fair bit more expensive. I really haven't looked into MSCS
(wolfpack) much at all. I'll be interested to see how it works out for you.

Mike Stankavich, CTO

NorFab/ISP, Inc.
921 SW Washington St
Portland OR 97205

(503) 972-2822 direct
(503) 972-2810 office

-----Original Message-----
From: Victor A. <>
To: <>
Date: Friday, July 10, 1998 4:29 PM
Subject: Redundancy & Fault Tolerance

I need the expert advice of those of you that have implemented some sort of
Redundancy and fault tolerance in your location. Right now I only have a
single Web Server running IIS 4.0, SQL 6.5, CF 3.1 and a couple of other
applications that run on top of the Web Server. I do back everything every
night but that's not what I'm interested in at this point. I'm adding a new
server next week and I want to implement redundancy in two ways (please
correct me if I'm dreaming here):

1) I want the load be distributed in both servers and

2) If one of the servers fails I want the other one to immediately take
over so that not a single user notice our Web Services are down.

I know this can be done, the question is: What is the best way to
accomplish it?

If anyone out there has done something similar and is willing to share the
"know how" I will greatly appreciate it.

Best to all,