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

Glossary
334 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Command Line Interface Reference Guide
storage subsystem
The controllers, storage devices, shelves, 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.
stripe size
The stripe capacity as determined by n–1 times the chunksize, where n is the number of
RAIDset members.
striped mirrorset
See RAID level 0+1
stripeset
See RAID level 0
striping
The technique used to divide data into segments, also called chunks. The segments are
striped, or distributed, across members of the stripeset. This technique helps to distribute
hot spots across the array of physical devices to prevent hot spots and hot disks.
Each stripeset member receives an equal share of the I/O request load, improving
performance.
surviving controller
The controller in a dual-redundant configuration pair that serves its companion’s devices
the companion controller fails.
switch
A method that controls the flow of functions and operations in software.