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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Solving Common Problems with Hosting CompaniesSolving Common Problems with Web Hosting Companies
by Robin Nobles
For those of you with Web sites, you probably know what a "host" is. It's a company that provides a location, or address, on the Internet where your Web site resides.
In other words, just like a physical business needs an address, so does a Web site. You can't have a Web site and just "stick it up" on the Web. Unless you want to set up your own server, you have to go through a hosting company who gives you that address, including server space and bandwidth, that enables the search engines and visitors to find your site.
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