After reading that experiment in which someone used a bunch of cheap celeron
boxes with WLBS and CF professional to cluster, I did some reading up on
WLBS.

WLBS is what it is called on NT4. It is now NLB of Windows2000.

It is free on NT4 Enterprise, or Win2k Advanced Server. I don't know how
much it costs, elsewise.

Drawback: it only works at the stack level. As someone stated, if your web
server (IIS) is in lala land, but still returning pings, WLBS will continue
to make requests. You have to get a third party service monitoring system
that will run a command line command to turn off the WLBS. This is
documented in Microsoft's knowledge base.

http://support.microsoft.com/support/kb/articles/Q234/1/51.ASP

WLBS is not intended to work with SQL server, file serves, for example. For
this they have another product, MSCS (Microsoft Cluster Service).

The link below is an overview of MS Clustering in general that I found very
useful:

http://www.microsoft.com/ntserver/ntserverenterprise/exec/overview/clusterin
g/default.asp


Matt

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