RAID-Z is the technology used by ZFS to implement a data-protection scheme which is less costly than mirroring in terms of block overhead. Here, I’d like to go over, from a theoretical standpoint, the performance implication of using RAID-Z. The goal of this technology is to allow a storage subsystem to be able to deliver the stored data in the face of one or more disk failures. This is accomplished by joining multiple disks into a N-way RAID-Z group. Multiple RAID-Z groups can be dynamically striped to form a larger storage pool.
There are many frameworks available for the PHP programming language nowadays, and especially a lot of RAD (Rapid Application Development) frameworks which aim to make web development faster, less tedious and more organized. CakePHP was one of the first frameworks to port the RAD philosophy – which became so popular after Ruby on Rails – to the PHP programming language. CakePHP v1.0 is now one of the most popular and intuitive solutions for PHP programming, let’s discover why…
At PC World, we spend most of our time talking about products that make your life easier or your work more productive. But it’s the lousy ones that linger in our memory long after their shrinkwrap has shriveled, and that make tech editors cry out, “What have I done to deserve this?”
Still, even the worst products deserve recognition (or deprecation). So as we put together our list of World Class winners for 2006, we decided also to spotlight the 25 worst tech products that have been released since PC World began publishing nearly a quarter-century ago.
Just a sampling..
# Only Jack Bauer can fly a plane from the luggage compartment.
# If everyone on “24” followed Jack Bauer’s instructions, it would be called “12”.
# Once, someone tried to tell Jack Bauer a “knock knock” joke. Jack Bauer found out who was there, who they worked for, and where the goddamned bomb was.
# Jack Bauers calender goes from March 31st to April 2nd, no one fools Jack Bauer.
On an August morning in 1978, French filmmaker Claude Lelouch mounted a gyro-stabilized camera to the bumper of a Ferrari 275 GTB and had a friend, a professional Formula 1 racer, drive at breakneck speed through the heart of Paris. The film was limited for technical reasons to 10 minutes; the course was from Porte Dauphine, through the Louvre, to the Basilica of Sacre Coeur.
No streets were closed, for Lelouch was unable to obtain a permit.
The driver completed the course in about 9 minutes, reaching nearly 140 MPH in some stretches. The footage reveals him running real red lights, nearly hitting real pedestrians, and driving the wrong way up real one-way streets.
Upon showing the film in public for the first time, Lelouch was arrested. He has never revealed the identity of the driver, and the film went underground until a DVD release a few years ago.