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In larger installations, the area within the 'Computer Centre' in which the main computer systems are located. The term originates from the design of such rooms, which usually had half, or full, height glass windows on all sides, suggestive of life in a fish tank. Tanks are specially constructed rooms with complex environmental controls, because mainframe computers require low humidity and a relatively cool atmosphere. Access to 'the tank' is restricted to authorised personnel only, and usually have independent, clean line, uninterruptible power supplies, and extra (non-H2O) fire protection.

There are fewer Tanks to be seen now as newer servers do not require such critical climate control, but ALL systems irrespective of size, need reliable power supplies, and should be afforded proper fire protection.

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