HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Command Line Interface Reference Guide (EK-G80CL-RA. C01, March 2005)

Glossary
314 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Command Line Interface Reference Guide
association set
A group of remote copy sets that share selectable attributes for failover. Members of an
association set transition to the same state simultaneously. For example, if one association
set member assumes the failsafe locked condition, then other members of the association set
also assume the failsafe locked condition. An association set can also be used to share a log
between a group of remote copy set members that require efficient use of the log space. See
also remote copy set.
asynchronous
Pertaining to events that are scheduled as the result of a signal asking for the event;
pertaining to that which is without any specified time relation. See also synchronous.
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.
backplane
The electronic printed circuit board into which you plug subsystem devices—for example, a
controller or power supply.
bad block
A data block containing a physical defect.
bad block replacement
See BBR
battery hysteresis
The ability of the software to allow writeback caching during the time a battery is charging,
but only a previous down time has not drained more than 50 percent of rated battery
capacity.
BBR
Bad Block Replacement. 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.
BIST
Built-in self-test. A diagnostic test performed by the controller software on the controller’s
policy processor.
bit
A single binary digit having a value of either 0 or 1. A bit is the smallest unit of data a
computer can process.