Specifications

Glossary
113Continuous Access and Data Replication Manager SAN Extensions Reference Guide
Internet Protocol (IP)
An address of a device on a network using TCP/IP.
interswitch link (ISL)
A connection between two switches using their expansion ports.
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.
maximum transmission rate
A user-defined data transfer parameter that is used to govern the highest speed at which data
may flow from a gateway device.
merge or merging
Transferring the contents of the log to the destination disk in order to synchronize the source
and destination disks.
mirroring
The act of creating an exact copy or image of data.
multimode fiber (MMF)
In fiber optics, a class of fibers with a core thick enough for light to take several paths (known as
nodes) through the core. The core for a multimode fiber is normally either 50 microns or 62.5
microns.
network
In data communication, a configuration in which two or more terminals or devices are
connected to enable information transfer.
Quality of Service (QoS)
Each virtual connection in an ATM network has a service category. The performance of the
connection is measured by six established QoS parameters, which are outlined by the ATM
forum.
redundancy
The provision of multiple interchangeable components to perform a single function to deal with
failures and errors. A RAIDset is considered to be redundant when user data is recorded directly
to one member, and all the other members and associated parity also are recorded. If a member
is missing from the RAIDset, its data can be regenerated as needed, but the RAIDset is no
longer redundant until the missing member is replaced and reconstructed.