Data Replication Manager Windows-Based Server with Single Host Bus Adapter - Application Notes

Glossary
Application Notes – Data Replication Manager Windows-Based Server with Single Host Bus Adapter 19
latency The amount of time required for a transmission to reach its
destination.
link A connection between two adjacent Fibre Channel ports, consisting
of a transmit fiber and a receive fiber. An example is the connection
between the Fibre Channel switch port and the HSG80 controller.
local site For subsystems using the disaster tolerant Data Replication Manager
solution, the local site is the SAN that is the primary source of
information. When a system outage occurs, the database is recovered
from the remote site SAN.
log disk A single, dedicated log unit for a particular association set. The
association set members must all be in the NORMAL error mode
(not failsafe).
LUN An acronym for logical unit number A physical or virtual device
addressable through a target ID number. The logical unit numbers
(LUNs) use their target’s bus connection to communicate on the
SCSI bus.
mirroring The act of creating an exact copy or image of data.
multibus failover A process that allows a controller to take over total control of the
storage subsystem in the event of the failure of its companion
controller.
multimode fiber (MMF) Optical fiber that is designed to carry multiple light rays or modes
concurrently.
network In data communication, a configuration in which two or more
terminals or devices are connected to enable information transfer.
redundancy The provision of multiple interchangeable components to perform a
single function to deal with failures and errors.
remote copy set A feature that allows data to be copied (mirrored) from the
originating site (initiator) to a remote site (target). The result is a
mirror copy of the data (remote copy set) at two disparate sites. Used
in disaster tolerant (DT) applications such as the Data Replication
Manager.
remote site For subsystems using the disaster tolerant Data Replication Manager,
data processing occurs at a local SAN site and the data is replicated
or mirrored to the remote site SAN. When local system outage
occurs, the database is recovered from the remote site system.