EMC Symmetrix DMX-3 Product Guide
309
Glossary
This glossary contains terms related to disk storage subsystems.
Many of these terms are used in this manual.
A
alternate track A track designated to contain data in place of a defective primary
track. See also “primary track.”
actuator A set of access arms and their attached read/write heads, which
move as an independent component within a head and disk assembly
(HDA).
adapter A board that provides the physical interface between the director and
disk drives (disk adapter), and various host channels (Fibre Channel,
iSCSI, GigE, FICON, and ESCON adapters).
ADT Automatic Diagnostic Test.
ANSI American National Standards Institute. A standards-setting,
nongovernment organization which develops and publishes
standards for voluntary use in the U.S.
asynchronous
transmission
Transmission in which synchronization is done on a per-byte basis.
The synchronizing handshake is done using REQuest and
ACKnowledge signals.
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