Specifications

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GL–2 Compaq StorageWorks HSG80 Array Controller ACS Version 8.5 Maintenance and Service Guide

arbitrated loop

physical address

Abbreviated AL_PA. A one-byte value used to identify a port in an Arbitrated

Loop topology. The AL_PA value corresponds to bits 7:0 of the 24-bit Native

Address Indentifier.

array controller See controller.

array controller

software

Abbreviated ACS. Software contained on a removable ROM program card

that provides the operating system for the array controller.

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 assocation 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. 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.