Hitachi G1000 - Page 196

• 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.
E
ethernet
A computer networking technology for local-area networks.
extent
A contiguous area of storage in a computer file system that is reserved for
writing or storing a file.
F
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 fibre 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.
196 Glossary
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide