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

Glossary G–15
synchronous mode A mode of operation of the remote copy set whereby the data is written
simultaneously to the cache of the initiator subsystem and the cache of the
target subsystem. The I/O completion status is not sent until all members of
the remote copy set are updated.
See also asynchronous mode.
this controller The controller that is serving your current CLI session through a local or
remote terminal.
See also other controller.
TILX Tape inline exerciser. The controller’s diagnostic software to test the data
transfer capabilities of tape drives in a way that simulates a high level of user
activity.
UBR An abbreviation used to express an unspecified bit rate. The UBR is a
category of ATM service that supports connections that have no specified
performance requirements.
ULP Upper Layer Protocol.
ULP process A function executing within a Fibre Channel node which conforms to the
Upper Layer Protocol (ULP) requirements when interacting with other ULP
processes.
UltraNet Wizard A term used to express the Fibre Channel-to-ATM Configuration Wizard.
This wizard is an UltraNet application that allows the designation of the
default configuration settings for Fibre-Channel-ATM on the Open Systems
Gateway.
unit A container made accessible to a host. A unit may be created from a single
disk drive or tape drive. A unit may also be created from a more complex
container such as a RAIDset. The controller supports a maximum of eight
units on each target.
unplanned failover As applied to the Data Replication Manager: unplanned failover is a term
used to express the unplanned outage of the controllers. This may occur
when the site communication is lost or due to some other failure whereby
remote copy sets cannot be implemented. The controllers do not perform an
orderly shutdown.
See also planned failover.