Farm and Windows Load balancing
Guys, I had two MOSS Server in a simple farm. I deployed MOSS and create Site collection and one top level site. I tried to access the site from Web01, I could. but when I tried to access the web site from Web01, I've got blank page, is it symptom for a problem. A colleague of mine told me that is expected behvior. Notice that I used windows load balancing and I want to make sure that traffic is distributed over the two servers. Lastly, if one of the server comes down, will WLB reroute the request to the healthy server?
March 17th, 2010 1:33pm

are you talking about a simple farm having 2 web servers? can you clarify the line "I tried to access the site from Web01, I could. but when I tried to access the web site from Web01, I've got blank page"???
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March 17th, 2010 1:38pm

Yes, I'm talking about Simple web farm having 2 web server. I mean by this statement that: why I type the following your: http://web01/mysit, this works but when I type http://web02/mysite, I receive a blank page. actually, I have another third url which points to the load balancing IP address: http://mysite --> load balaning IP address. I hope this make my question clear.
March 17th, 2010 6:33pm

Hi Tareq,firstly, to make sure that tha traffic is distributed, you can make a simple trick, you can down one of your wfe server then check if your web application works fine or not, then reverse the operation with the second wfe.secondly, if one of the server comes down, NLB will detect that then will direct to the healthy server.third, regarding web02, could you please verify that you have configured AAM correctly?hope this help.Best Regrads, Ahmed Madany
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March 17th, 2010 7:47pm

Hi Tareq, Are you using host headers within IIS or AAM's within CA? this would 'appear' to make the web site look unavailable asIIS wouldn't be able to bind to the site. Have you checked within IIS that you can browse each site?Finally, on either front end server; if you use a local host file, with the LB DNS name- changing the IP address for each of your WFE's (your need to flushdns when changing the IP address), does this bring back 2 web sites? RegardsAaron Aaron
March 18th, 2010 8:24pm

firstly, to make sure that tha traffic is distributed, you can make a simple trick, you can down one of your wfe server then check if your web application works fine or not, then reverse the operation with the second wfe. First, Second: I knew that WLD doesn't detect if the sever is down, it is limited, i.e. if he http request return error, it will forward the error as is. if this is not correct, please refer application documentation that corrects that. Third: wha is AAM?
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March 22nd, 2010 10:54pm

I use host headers, and I update the alternative url mapping in sharepoint administration. I could browse the first site, the second load blank page
March 22nd, 2010 10:57pm

According to http://technet.microsoft.com/en-us/library/cc739690(WS.10).aspx ,each NLB Cluster host emits heartbeats to the other hosts in the cluster. If a host fails and stops emitting heartbeats, then after a default time period of five seconds, the remaining hosts in the cluster undergo a process called convergence to remove the failed host from the cluster and have new client connection requests mapped to remaining hosts in the cluster. Does this answer your question " I knew that WLD doesn't detect if the sever is down, it is limited, i.e. if he http request return error, it will forward the error as is. if this is not correct, please refer application documentation that corrects that."? Suppose you have two WFEs, the computer names are web01 and web02, you may choose one of the computer name, say, web01, as network load balanced URL in SharePonit web application. And in DNS, point web01 to the public IP address for the NLB cluster. When you visit the site with http://web01/mysite, first, the NLB public IP address would be resolved from the Web01 host name in DNS, and then the request would be directed to one of the WFE in NLB cluster. If you visit the site with http://web02/mysite, first, you should make sure the DNS entry for web02 is correctly setup. You should also add web02 as another internal URL for your web application web01 in AAM, or you can extend web01 to web02. What’s your AAM setting for the site and how your load balanced URL set in DNS? Gu Yuming TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com
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March 23rd, 2010 10:55am

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