User`s guide

CDU
Cable distribution unit. The power entry device for StorageWorks cabinets. The
unit provides the connections necessary to distribute ac power to cabinet shelves
and fans.
CI bus
Computer interconnect bus. Uses two serial paths, each with a transfer rate of
70 MB/s (8.75 MB/s).
CLI
Command line interpreter. Operator command line interface for the HS family
controller firmware.
container
Any entity that is capable of storing data, whether it is a physical device or a
group of physical devices. A disk, a stripeset, and a RAIDset are examples of a
container.
controller shelf
A StorageWorks shelf designed to contain controller and cache memory modules.
CRC
An 8-character cyclic redundancy check string used in conjunction with the
customer identification string for turning on licensed features such as RAID and
write-back caching.
data center cabinet
A generic reference to the large cabinets, such as the SW800-series, in which
StorageWorks components can be mounted.
DDL
dual data link. The ability to operate on the CI bus using both paths at the same
time.
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.
DILX
Disk Inline Exerciser. Diagnostic firmware used to test the data transfer
capabilities of disk drives in a way that simulates a high level of user activity.
DSA
Digital Storage Architecture. A set of specifications and interfaces describing
standards for designing mass storage products. DSA defines the functions
performed by host computers, controllers, and disk drives. It also specifies how
they interact to accomplish mass storage management.
DSSI
Digital Storage System Interconnect. A Digital-specific data bus with an 8-bit
data transfer rate of 4 to 5 MB/s.
Glossary–2