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Windows Server Forum / Windows Media Server / March 2004

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NLB issues

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Duck - 11 Mar 2004 10:31 GMT
A few weeks back while i was off str01 svr in my streaming environment stopped streaming content. I have three Win2003 WMS servers that are "clustered" with Network Load Balancing Manager. They have a cluster IP of .144 - The puzzling thing is that I can stream content from str01 directly by going to its own IP .141 but not through the cluster IP of .144 if i stop the other two servers. It seems as if NLB is the root of the problem but I may be wrong
I have since deleted the NLB cluster name and re-created from scratch, but still the same problem. If i leave str01 as the only active svr i cant stream anything, soon as i start one of the others the stream works. From my SNMP monitoring I can see when the server stopped streaming but there is nothing useful in the event logs
I see the same funny behaviour before and after re-creating the NLB cluster options again. If I start NLBM on str01 and type in its host name, it only picks itself up in the cluster and not the other two. If I load NLBM on the other two servers and type in their respective hostnames they both pickup that they (str02 & str03) are part of the cluster but it does not pick up str01. In fact the NLBM thinks they are different clusters for some reason. Yet on the cluster parameters tab the network adresses are indentical. I am stumped as to why this is happening. Any help greatly appreciated

It was first established there was a problem because users were not able to stream 1 in 3 streams and it was discovered that str01 was not being added to the NLBM interface. My three streaming servers access a remote NAS cluster resource that holds the data

Thanks.
Duck - 30 Mar 2004 08:56 GMT
Hi just to let you know i found the issue... Basically for the cluster to work correctly your switch must be configured to allow BROADCAST traffic else the cluster won't be able to distribute traffic across all 3 nodes correctly. My node1 was not seeing the broadcast traffic from the other two nodes only itself so i rectified the switch problem

Cheers Duck
 
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