Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide

Glossary G–13

QoS A term used to express Quality of Service in an ATM network. Each virtual

connection in an ATM network is set to a service category. The performance

of the connection is measured by the established QoS parameters (outlined

by the ATM forum).

Performance issues include data, rate, cell loss rate, cell delay, and delay

variation (jitter).

Categories of ATM service are:

■ Constant Bit Rate (CBR)

■ Variable Bit Rate-Real Time (VBR-RT)

■ Variable Bit rate- Non-Real Time (VBR-NRT)

■ Available Bit Rate (ABR)

■ Unspecified Bit Rate (UBR).

redundancy The provision of multiple interchangeable components to perform a single

function in order to cope with failures and errors. A RAIDset is considered to

be redundant when user data is recorded directly to one member and all of the

other members include associated parity information.

remote copy sets 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 tolerance (DT)

applications such as the Data Replication Manager.

CLI commands available are: ADD REMOTE_COPY_SETS,

SET remote-copy-set-name, SET controller REMOTE_COPY.