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

G–2 Compaq StorageWorks Data Replication Manager HSG80 ACS V8.5P Operations Guide
association sets An association set is a group of remote copy sets that share common
attributes. Members of an association set can be 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
CLI commands available are ADD ASSOCIATIONS and SET associations.
asynchronous mode A mode of operation of the remote copy set whereby the write operation
provides command completion to the host after the data is safe on the
initiating controller, and prior to the completion of the target command.
Asynchronous mode can provide greater performance and response time, but
the data on all members at any one point in time cannot be assumed to be
identical.
)See also synchronous mode.
ATM An abbreviation for Asynchronous Transfer Mode. This abbreviation refers
to a technology used in LANs and WANs to enable disparate traffic (i.e.,
data, voice, and video) to be carried over the same Local or Wide Area
Network. ATM is the transfer mode of choice for broadband integrated
services digital networks (BISDNs). ATM traffic carries information in
fixed-size cells.
autospare A controller feature that automatically replaces a failed disk drive. Autospare
aids the controller in automatically replacing failed disk drives. You can
enable the AUTOSPARE switch for the failedset causing physically replaced
disk drives to be automatically placed into the spareset.
Also called “autonewspare.”
bad block A data block that contains a physical defect.
bad block replacement Also known by the term BBR. BBR is a replacement routine that substitutes
defect-free disk blocks for those found to have defects. This process takes
place in the controller, transparent to the host.
BBR See bad block replacement.