Glossary

drive LED

Disk indicator LED that illuminates during Read or Write operations.

dual-level array

Logical disk created from two or more single-level arrays. See also RAID 10, RAID 50.

E

enclosure

Physical housing for disks, which usually contains one or more power supplies, fans, and temperature sensors. Enclosures are normally external to the computer to which they are connected, although some computers do contain internal enclosures.

enclosure management device

Processor that monitors the fan, power supplies, temperature sensors, and drive presence within a drive enclosure.

event

Notification or alert from the system, indicating that a change has occurred.

event log

File used to maintain information about prior controller activities or errors.

event notification

Means used by the system to communicate information about events that have occurred.

expand

Add space to an array by adding available space.

A-5