User`s guide

controller and SBB shelf
A generic reference to a StorageWorks shelf that can contain both controller SBBs
and storage SBBs, for example, a BA350–EA shelf.
controller shelf
Any StorageWorks shelf that contains only ] controllers and cache memories, for
example, a BA350–MA shelf.
deskside expansion unit
The StorageWorks floor mounted stand stand that encloses a BA350–SA SBB
shelf. Two units are used to enclose a BA350–EA controller and SBB shelf.
differential SCSI bus
A signal’s level is determined by the potential difference between two wires.
A differential bus is more robust and less subject to electrical noise than is a
single-ended bus.
disk
A storage device supporting random access to fixed size blocks of data.
DWZZA
The StorageWorks compatible SCSI bus signal converter.
See SCSI bus signal converter.
electromagnetic interference
See EMI.
electrostatic discharge
See ESD.
EMI
Electromagnetic interference. The impairment of a signal by an electromagnetic
disturbance.
ESD
Electrostatic discharge. The discharge of a potentially harmful static electric
voltage as a result of improper grounding.
full-height
(1) In the storage industry, a device of conventional dimensions. (2) A single
device mounted in an 5¼-inch SBB. Full-height devices have an order number
suffix of "VA."
half-height
(1) In the storage industry, a device of conventional dimensions, except for height.
(2) A device that occupies only one-half of a 5¼-inch SBB. The first half-height
device is always mounted in the lower (bottom) part of the SBB. The second
device in an SBB is mounted in the upper (top) part of the SBB.
host
The primary or controlling computer or any such (in a multiple computer
network) to which storage is attached.
Glossary–2