> setup. Were about to install one on Wednesday. It'll be our
> first non hardware based cluster and I'm a little skeptical.
> Any hurdles or dos and don'ts are greatly appreciated.
Are you planning on using NLB in addition to JRun clustering, or instead of
it?
NLB clustering itself is pretty easy to set up. I did that last week for a
client, actually. Ideally, each cluster member should have two NICs, so that
you can run NLB traffic on one NIC of each machine. If you don't have two
NICs, you'll need to choose the "Multicast" option for each host. NLB
clustering doesn't do anything for you if CFMX itself should fail, though -
you'll need to monitor your CF services yourself. If you're using NLB to
cluster access to your web server, and you're using session variables within
your applications, you'll have to set up "sticky" sessions within the NLB
interface. I think the option is called "single affinity".
You might find these links helpful:
http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/
clustering/nlb-trbl.mspx
http://www.west-wind.com/presentations/loadbalancing/NetworkLoadBalancingWin
dows2003.asp
http://techrepublic.com.com/5100-6268_11-1048675.html
JRun clustering, on the other hand, will cluster your JRun instances
themselves, so you might have a single web server that talks to multiple
JRun instances through a JRun cluster.
It is possible to combine web server clustering (NLB) and JRun server
clustering, although I'm not sure whether that's worth doing.
If you have any questions about NLB, feel free to contact me directly.
Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
phone: 202-797-5496
fax: 202-797-5444
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