HP StorageWorks Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide (AA-RPHZF-TE, March 2004)

Glossary
240 Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide
disaster tolerance
As applied to DRM, disaster tolerance provides the ability for rapid recovery of user data from a remote location
when a significant event or a disaster occurs at the primary computing site.
See also remote copy sets, DT.
DT
An acronym for disaster tolerance.
See disaster tolerance.
dual-redundant configuration
A storage subsystem configuration consisting of two active controllers operating as a single controller. If one
controller fails, the other controller assumes control of the failing controller’s devices.
See also failover, failback.
ECB
An acronym for external cache battery.
See external cache battery.
EMU
Environmental Monitoring Unit. A device that provides increased protection against catastrophic failures. Some
subsystem enclosures include an EMU, which works with the controller to detect conditions such as failed
power supplies, failed blowers, elevated temperatures, and external air sense faults. The EMU also controls
certain rack hardware, including alarms, fan speeds, and certain chips.
environmental monitoring unit
A piece of hardware that provides increased protection against catastrophic failures. Some subsystem enclosures
include an EMU, which works with the controller to detect conditions such as failed power supplies, failed
blowers, elevated temperatures, and external air sense faults. The EMU also controls certain rack hardware,
including DOC chips, alarms, and fan speeds.
external cache battery
The unit that supplies backup power to the cache module in the event the primary power source fails or is
interrupted.
E1
The standard European carrier for transmission at 2.048 Mbit/sec.
E2
The standard European carrier for transmission at 8.192 Mbit/sec.
E3
The standard European carrier for transmission at 34.368 Mbit/sec.
E4
The standard European carrier for transmission at 139.264 Mbit/sec.
E5
The standard European carrier for transmission at 565 Mbit/sec.
F_port
A port in a fabric where an N_Port or NL_Port may attach.
fabric
A network of Fibre Channel switches or hubs and other devices.