Hitachi 9960 Glossary, Carb, Cache, Chip, C–Hsn, Client/Server Architecture, Cm–Hsn, Cold site

Glossary

CARB

Cache memory Arbitrator circuit. Hitachi designed logical circuit in the Cache Switch (CSW) used to arbitrate access to cache.

Cache

Cache (pronounced cash) can be either on-chip memory circuits in a microprocessor (e.g. L2 processor cache), a reserved section of main memory (e.g. system or server cache), or an independent, high-speed disk storage device (e.g. a Web cache). Two types of caching are commonly used in personal computers: memory caching and disk caching. Disk caching can dramatically improve the performance of applications, because accessing a byte of data in RAM can be thousands of times faster than accessing a byte on a hard disk. When data is found in the cache, it is called a cache hit, and the effectiveness of a cache is judged by its hit rate.

CHIP

Client Host Interface Processor.

C–HSN

Cache Hierarchical Star Network.

CHT

Channel adapter Tachyon. (For Fibre Channel interfaces).

Client/Server Architecture

Client/Server Architecture is a network architecture in which each computer or process on the network is either a client or a server. Servers are powerful computers or processors dedicated to managing disk drives (file servers), printers (print servers),

or network traffic (network servers). Clients are PCs or workstations on which users run applications. Clients rely on servers for resources, such as files, devices, and even processing power.

CMA

Control Memory Adapter.

CM–HSN

Control Memory, Hierarchical Star Network.

Cold site

An alternate facility that is void of any resources or equipment except air-conditioning and raised flooring. Equipment and resources must be installed in such a facility to duplicate the critical business functions of an organization. Cold sites have many variations, depending on their communication facilities, UPS systems, or mobility. See also: Shell site, Recovery site, Alternative site.

53