drive box
Chassis for mounting drives that connect to the contr
oller bo
x.
■
Drive bo
x
es with AC power supply:
●
DBS, DBL, DBF: Drive box (2U)
●
DBX: Drive box (4U)
●
DBW: Drive box (5U)
■
Drive boxes with DC power supply:
●
DBSD: Drive box (2U)
●
DBLD: Drive box (2U)
drive I/O module
I/O module for the controller box that has drive interfaces.
duplex
The transmission of data in either one or two directions. Duplex modes are full-duplex and
half-duplex. Full-duplex is the simultaneous transmission of data in two directions. For
example, a telephone is a full-duplex device, because both parties can talk at once. In
contrast, a walkie-talkie is a half-duplex device because only one party can transmit at a time.
ethernet
A computer networking technology for local-area networks.
extent
A contiguous area of storage in a computer le system that is reserved for writing or storing a
le.
fabric
Hardware that connects workstations and servers to storage devices in a storage-area
network (SAN)N. The SAN fabric enables any server to any storage device connectivity through
the use of bre channel switching technology.
failback
The process of restoring a system, component, or service in a state of failover back to its
original state (before failure).
failover
Automatic switching to a redundant or standby computer server, system, hardware
component, or network upon the failure or abnormal termination of the previously active
application, server, system, hardware component, or network. Failover and switchover are
essentially the same operation, except that failover is automatic and usually operates without
warning, while switchover requires human intervention.
fault tolerance
A system with the ability to continue operating, possibly at a reduced level, rather than failing
completely, when some part of the system fails.
FC
Fibre Channel
Glossary
Hitachi Virtual Storage Platform G1000, G1500, and VSP F1500 Hardware Guide 178
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