high availability

高可用性，ハイアベイラビリティ

個々の構成部品の信頼性から算定される以上のきわめて長い時間，（中断することなく）連続的にその機能を果たすシステムの能力．高可用性(HA)はほぼ耐障害性によって決定され，容易に定量化できるものではない．高可用といわれるシステムの限界と，非常に優れている可用性の度合いは，どちらもケースバイケースで判断するしかできない．

使用分野: Computer System

The ability of a system to perform its function continuously (without interruption) for a significantly longer period of time than the reliabilities of its individual components would suggest. High availability (HA) is most often achieved through failure tolerance. High availability is not an easily quantifiable term. Both the bounds of a system that is called highly available and the degree to which its availability is extraordinary must be clearly understood on a case-by-case basis.

CONTEXT[Computer System]

« 用語集に戻る