HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Glossary
298 HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide
SCSI bus
An electrical connection where one wire carries the signal and another wire or shield is
connected to electrical ground. Each signal logic level is determined by the voltage of a
single wire in relation to ground. This is in contrast to a differential connection where the
second wire carries an inverted signal.
spareset
A collection of disk drives made ready by the controller to replace failed members of a
storageset.
star coupler
The physical hub of the CI cluster subsystem cabling. The star coupler is a set of connection
panels, contained within a cabinet containing cable connections and transformers through
which the nodes of a cluster connect to one another through the CI bus.
See also nodes and CI bus.
storage array
An integrated set of storage devices
storage array subsystem
See storage subsystem.
storage subsystem
The controllers, storage devices, enclosures, cables, and power supplies used to form a mass
storage subsystem.
storage unit
The general term that refers to storagesets, single-disk units, and all other storage devices
that are installed in your subsystem and accessed by the host. A storage unit can be any
entity that is capable of storing data, whether it is a physical device or a group of physical
devices.
See also container.
storageset
(1) A group of devices configured with RAID techniques to operate as a single container.
(2) Any collection of containers, such as stripesets, mirrorsets, striped mirrorsets, and
RAIDsets.
storageset expansion
The dynamic expansion of the storage capacity (size) of a unit. A storage container is
created in the form of a concatenation set which is added to the existing storage set defined
as a unit.
stripe
The data divided into blocks and written across two or more member disks in an array.