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Glossary 39
failover (cluster)
1. The process that takes place when one controller in a dual-redundant
configuration assumes the workload of a failed companion controller.
Failover continues until the failed controller is repaired or replaced.
2. The process that takes place when the operation of a cluster group moves
from one cluster node to another node in the same cluster.
fault tolerance
The ability of a system or component to continue normal operation when a fault
(or failure) is encountered. Tolerance is achieved primarily by designing
redundant elements into the system.
Fibre Channel
An IEEE standard for providing high-speed data transfer among workstations,
servers, mainframes, supercomputers, desktop computers, storage devices, and
display devices.
Gigabit Interface Converter-Shortwave
A device that converts electrical signals to optical signals at the point where the
fiber cables connect to the Fibre Channel elements, such as controllers or
adapters.
heartbeat
A signal transmitted between cluster nodes to indicate whether the nodes are
operating.
high availability
A term used to identify a computer system that can continuously deliver services
to its clients 99.9 % of the time (no more than 8.5 hours of downtime per year).
host
The primary or controlling computer in a system of computers connected by
communication links.