HP StorageWorks HSG80 ACS Solution Software V8.8 for HP-UX Installation and Configuration Guide (AA-RV1FA-TE, March 2005)

Glossary
240 HSG80 ACS Solution Software V8.8 for HP-UX Installation and Configuration Guide
association set A group of remote copy sets that share selectable attributes for logging
and 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.
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. To
aid 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
Abbreviated BBR. 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.
backplane The electronic printed circuit board into which you plug subsystem
devices—for example, the SBB or power supply.
battery
hysteresis
The ability of the software to allow write-block caching during the
time a battery is charging, but only when a previous down time has not
drained more than 50 percent of rated battery capacity.
BBR See bad block replacement.
BIST See built-in self-test.
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.
block Also called a sector. The smallest collection of consecutive bytes
addressable on a disk drive. In integrated storage elements, a block
contains 512 bytes of data, error codes, flags, and the block address
header.
bootstrapping A method used to bring a system or device into a defined state by
means of its own action. For example, a machine routine whose first
few instructions are enough to bring the rest of the routine into the
computer from an input device.