Webfarms II: Balancing The Load. Okay, so you understand webfarms now. What's the magic that actually distributes the load, and how does it determine how the distribution is handled?
At ORCS Web we use the Foundry Server Iron products to perform our webfarm load-balancing. If one of them fails, the other instantly takes over (In our testing, it had sub-second fail-over!)
So what is this "Server Iron" thing? In simplest terms, it's a layer 4-7 switch. It has multiple network ports on it and can be used literally like other types of switches. But, it can also load-balancing and traffic distribution. A VIP (virtual IP) can be assigned to the SI (Server Iron) and it then handles all traffic sent to that address/VIP. Further configuration is done to tell the SI what to actually do with the traffic sent to the VIP address.
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How to Analyze Your Web Site Traffic (Part 3)How to Analyze Your Web Site Traffic (Part 3 of a 3 Part Series) Copyright 2002 by Herman Drost
In Part 2 of this series, we discussed some of the ways to track your web site visitors. Now we will take a look at:
4. Web Traffic Analysis Software These are programs that analyze your server logs and then create traffic reports accordingly. The quality of the reports generated will depend on what software you actually use. Some log analyzers are free and come preinstalled on many hosting accounts, while others can cost a good deal of money.
Examples: Webalizer (http://www.webalizer.com) WebTrends (http://www.webtrends.com)
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