Technical Information
The flat, Earth-like world of Second Life is simulated on a large array of Debian servers, referred to as the Grid. The world is divided into 256x256 m areas of land, called Regions. Each Region is simulated by a single named server instance, and is given a unique name and content rating (PG, Mature or Adult). Multiple server instances can be run on a single physical server, but generally each instance is given a dedicated CPU core of its own. Modern servers with two dual-core processors usually support four separate server instances.
The Second Life world runs on Linden Time, which is identical to the Pacific Time Zone. The virtual world follows the North American Daylight Saving Time convention. Hence it runs 7 hours behind UTC most of the year, and 8 hours behind when Standard Time is in effect during the winter. The servers' log files actually record events in UTC, however.
Read more about this topic: Second Life Grid
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