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Load Balancing 101 Archive
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HTTP Message: The PDU of Layer 7
Posted on August 2, 2009 | No CommentsIf there’s one thing that made load balancing and web servers in general “click” with me, and make it much simpler to troubleshoot, it’s this: See the world like a load balancer. We see web pages, page layouts, “page cannot be displayed” errors, and menus. ... -
Moore’s Law and Bandwidth Consumption
Posted on May 27, 2009 | 1 CommentMost in IT are familiar with the concept of Moore’s Law, whereby processor capability tends to double about every two years. To a certain extent, this happens with networking equipment, with their capacity increasing at a steady rate, although probably not the same rate at... -
Load Balancing Performance Metrics 101
Posted on May 20, 2009 | 2 CommentsIn the previous post, I talked about the o3 article, and where I think they may have gotten it wrong (but it’s impossible to tell, as he didn’t publish any details on his testing methodologies, which is pretty lame). But that he may have used... -
Best of Both Worlds: Selective Source-NAT
Posted on March 11, 2009 | 1 CommentOne of the most common issues that comes up is something often referred to as the “same subnet” problem. In certain configurations, you cannot connect to a VIP (Virtual IP address, or Virtual Server) if the client you’re connecting from is on the same subnet... -
Quick and Dirty Performance Testing With Apache Bench
Posted on February 5, 2009 | No CommentsIf you need a quick and dirty way to throw some load onto a load balancer/ADC or web server, Apache comes with a great tool called Apache Bench. Since it’s an HTTP client, it will of course work with any server, not just Apache-based servers.... -
Definition Mission
Posted on May 17, 2008 | 1 CommentThere are a couple of terms in the realm of server load balancing (application delivery controllers) that can be somewhat confusing, because either there are multiple names for the same concept, or the same name means multiple concepts. I’m going to go over a few,... -
SMB: Keeping It Off The Load Balancer
Posted on May 13, 2008 | No CommentsMy recent Quick Look videos were inspired in large part by the highly hilarious “You Suck At Photoshop” series, which features 10 tutorials by the long-suffering Donnie Hoyle, Photoshop extrodinarre. But as I set about figuring out the logistics, one of the issues I had... -
Web Switching: What’s In A Name?
Posted on May 12, 2008 | 3 CommentsI think there are many people confused with the term “web switch”. I was definitely one of them, so I think it might help to explain what the term means. Part of the confusion for the term “web switch” stems from the fact that many... -
Top 5 Gotchas of Load Balancing (That Actually Are Your Fault… Sorta)
Posted on April 17, 2008 | 1 CommentEight years ago I wrote an article called “It’s Always The Load Balancer“, and eight years later, that’s still the case. But despite being the undeserved scape-goat of an infrastructure’s (and society’s) ills, there are a few things that actually are the load balancers fault... -
Duplex Mismatch Windows Tip
Posted on April 13, 2008 | 1 CommentA great little tool for Windows systems is the command “netstat -e“. I shall explain. A bane of of the network is the insidious duplex mismatch issue. This is when, through either autonegotion or auto-detection, one end of two cabled devices think the link is...