[THIN] Re: OT - Microsoft NLB

Hi Scott,
 
NLB is totaly unaware of any back-end services the server is providing. It 
maintains a working virtual NIC but if IIS etc is broken, users will still be 
directed to the "broken" server. If that isn't good enough, there are a number 
of relatively expensive hardware load balancers that are service aware.
 
regards,
 
Rick
 
Ulrich Mack 
Volante Systems 


________________________________

From: thin-bounce@xxxxxxxxxxxxx on behalf of Scott
Sent: Wed 1/11/2006 1:29
To: thin@xxxxxxxxxxxxx
Subject: [THIN] OT - Microsoft NLB


Sorry for the off-topic question but I'm hoping someone can clear the fog.  We 
are setting up a system that has two W2K3 servers configured to utilize 
Microsoft NLB.  Does the NLB logic to determine if a server is "available" for 
connections take into account the port of which the client is trying to connect 
on?  Say they are web servers and the WWW service crashes on one but the server 
is otherwise running, when a browser is trying to connect via the NLB name, is 
it possible for it to get routed to the server where the WWW service is down? 
The same for other custom apps, if it isn't running on one of the servers and 
the client tries to connect via NLB name and port, will the NLB logic try to 
connect it to the server where the app is down and therefore has less network 
connections? 

-- 

Thanks,
Scott D.


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