4 answers
It's racker and not raquer or craquer / cracker.
It's actually the term used to place the server in a bay slot: these large "cabinets" for computers actually have slots for storing machines, compartments called "racks", hence the term "racker".
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Configuration: Linux Debian Lenny / Kernel 2.6.26 / Gnome / Iceweasel 3
Internet Connection: ADSL Orange 8M (Livebox)
It's actually the term used to place the server in a bay slot: these large "cabinets" for computers actually have slots for storing machines, compartments called "racks", hence the term "racker".
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Configuration: Linux Debian Lenny / Kernel 2.6.26 / Gnome / Iceweasel 3
Internet Connection: ADSL Orange 8M (Livebox)
An item is said to be rackable when it has the necessary components to be "racked" in a bay, specifically support brackets to be incorporated into the bay via sliding rails. Basically, to rack a server, you must install the rails in the bay, pull them out, attach your machine, and push it back into the bay.
Example:
http://www.usinenouvelle.com/expo/medias/8/6/0/000026068_2.jpg
Although it's small, you can see that the servers are out of the bay: the gray strips along the server are actually the rails. The servers are clipped or even screwed in, which allows them to be removed/stored with minimal handling.
http://b6.o6.be/dsc01277_800.jpg
In this second photo, you can see that the servers "overhang" on the gray perforations: this is to screw them to the bay so that they don't move (in case the rail is too greasy...)
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Configuration: Linux Debian Lenny / Kernel 2.6.26 / Gnome / Iceweasel 3
Internet connection: ADSL Orange 8M (Livebox)