The following table shows the difference between 146GB RAID 5 IOPS/TB and 300GB RAID 10 IOPS/TB.
Each column represents a different Read percentage (the Write percentage is the inverse).
Negative numbers mean that for this Read percentage and IOPS requirement, RAID 10 gives more IOPS/TB of disk. Positive numbers mean that RAID 5 gives better…

Someone recently asked me how to setup redundant power for a rack of machines without relying on all the equipment to have dual power supplies. The answer is called an Automatic Transfer Switch. Depending on the sensitivity of your equipment to momentary losses of power, you can choose between an Open Transition Transfer Switch…

Selenium IDE is a QA tool for testing web applications. With the IDE extension for Firefox, you can easily create automatic tests for your websites. IBM has already picked up on this and the project seems very active (it jumped from v0.7 to v0.8 in front of my own eyes).

Recently this issue came up on the linux-il mailing list. Apparently one of the bigger Israeli ISPs started enforcing a bandwidth cap clause in their Terms of Service after they realized that their lines were overloaded. A couple people pulled out the following statistic: P2P still represented 60% of Internet traffic at the end…