Debian: Upgrade 6.0 Squeeze to v7.0 Wheezy

As Debian v7.0 Wheezy has been released for a while, we will show how to upgrade from v6.0 Squeeze here step by step. Before any operations, it’s highly suggested making a backup, as least for data files and configuration files of your major applications. Basically the upgrade is kind of easy as normal, we had […]
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Comprehensive system analysis by SystemTap

As system administrators, we’d better know SystemTap and be able to assemble its existed recipes for comprehensive system analysis. When I am on my way to make a collection of  systemtap scripts, I realize that I should give a brief introduction to this powerful design first, although it has been usable for years. From its […]
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Qperf: Measure IP networking performance

You may have heard of Netperf, which is a benchmark tool that is used to measure the performance of many different types of networking.  But normally what we care are the throughput and latency. As the throughput may affected by different factors like the package size, you may have to run many tests by Netperf […]
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