Digital Equipment AlphaServer 2000, Руководство пользователя

Страница: 172 / 196

cache memory
A small, high-speed memory placed between slower main
memory and the processor. A cache increases effective memory
transfer rates and processor speed. It contains copies of data
recently used by the processor and fetches several bytes of data
from memory in anticipation that the processor will access the
next sequential series of bytes.
card cage
A mechanical assembly in the shape of a frame that holds
modules against the system and storage backplanes.
carrier
The individual container for all StorageWorks devices, power
supplies, and so forth. In some cases because of small form
factors, more than one device can be mounted in a carrier.
Carriers can be inserted in modular shelves. Modular shelves
can be mounted in modular enclosures.
CD–ROM
A read-only compact disc. The optical removable media used in a
compact disc reader.
central processing unit (CPU)
The unit of the computer that is responsible for interpreting and
executing instructions.
client-server computing
An approach to computing whereby a computer—the ‘‘server’’—
provides a set of services across a network to a group of
computers requesting those services—the ‘‘clients.’’
cluster
A group of networked computers that communicate over a
common interface. The systems in the cluster share resources,
and software programs work in close cooperation.
Glossary–4