HP Array Controller HSG V8.7 Software - Manual (Page 528)

G–2 HSG80 User’s Guide
array controller software Abbreviated ACS. Software contained on a removable ROM program
card that provides the operating system for the array controller.
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.
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’s 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.
built-in self-test A diagnostic test performed by the array controller software on the
controller’s policy processor.