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

237Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide
Glossary
Glossary
Glossary
This glossary defines terms used in this guide or related to the Data Replication Manager. It is not a comprehensive
glossary of computer terms.
ACS
An acronym for array controller software. See array controller software.
adapter
A hardware device that converts the protocol and hardware interface of one bus type to another without
changing the function of either bus.
AL_PA
or
ALPA
An acronym for Arbitrated Loop Physical Address. A two-digit hexadecimal number that expresses a port’s
physical position on the loop. ALPA numbers are normally not assigned in sequence (that is, position 1 is not
ALPA 1, and so on). A table in the Fibre Channel Standard equates the loop position to the default ALPA.
arbitrated loop
A Fibre Channel topology. The basic definition is a ring of ports where the transmit output of one port is
attached to the receive input of the next. Each port has a unique loop address and it talks to other ports on the
loop by arbitrating for loop access. Loop addresses are assigned via cooperative port intercommunication during
loop initialization, which occurs any time the device configuration on the loop is physically changed. PLDA
(private loop direct attach), the specific profile implemented by the controller, is a subset of arbitrated loop.
See also PL_DA or PLDA.
array controller
See controller.
array controller software (ACS)
Software that is contained on a removable PCMCIA program card that provides the operating environment for
the array controller.
association sets
An association set is a group of remote copy sets that share common attributes. Members of an association set
are configured to transition to the same state at the same time. An association set:
■ Shares the same log unit
■ Has its host access removed from all members when one member fails
■ Keeps I/O order across all members
■ Fails over to the alternate controller in the event of primary controller failure.
CLI commands available are ADD ASSOCIATIONS and SET associations.