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Glossary of Terms
10BaseT
Ethernet with a data transfer rate of 10Mbits/sec.
100BaseT
Also known as Fast Ethernet with a data transfer rate of 100Mbits/sec.
AG
Array Group.
ACP
Array Control Processor. The group of processors on a PCB that performs the physical
access of the disk drives across four FC-AL loops.
ACP Pair
A combination of two ACPs, designed in such a manner as to facilitate redundancy
and performance.
Alert
A message or log that a computing element generates as the result of an error event
collection and analysis. An alert indicates that there is a need to perform some service
action, and it can be sent by a variety of methods to operations personnel.
API
Application Interface or API is a set of calls that allow software developers to interface
to a specific program.
Array Frame
Array frames are the (up to three) left and (up to three) right cabinets of the Hitachi
Freedom Storage
™
Lightning 9980V
™
systems housing HDDs (high density disks),
power supplies, and batteries.
Array Group
The physical arrangement of disk drives independent of RAID level used.
Asynchronous Remote Copy
The transmission of data between two devices that are not synchronized with a
clocking scheme or other technique. The sender can send data at any time and the
receiver can accept information when it becomes available. Synchronous
communication is an exactly timed stream of bits when the start of a character is
located by using a clocking mechanism such as bipolar encoding. See also Synchronous
Remote Copy and Hitachi TrueCopy
™
.