System information

Glossary
g-11
Glossary
credit See buffer-to-buffer credit.
CUP See control unit port.
customer support Synonym for technical support.
cyclic redundancy
check
CRC. System of error checking performed at both the sending and
receiving station using the value of a particular character generated
by a cyclic algorithm. When the values generated at each station are
identical, data integrity is confirmed.
D
daisy chaining Connecting one device to another in such a way that signals pass
from one device to the next.
DASD See direct access storage device.
database A collection of data with a given structure for accepting, storing, and
providing on-demand data for multiple users. (I)
data center A collection of servers and data storage devices, usually in one
location, administered by an information technology/information
services (IT/IS) manager.
data directory Critical information for all managed products (including directors
and switches). Information stored here includes:
• All configuration data
• All log files
• Call-home settings
• Firmware library
• Zoning library
datagram Synonym for Class 3 Fibre Channel service.
data integrity Refers to the validity of data. Data integrity can be compromised in a
number of ways including human errors when data is entered, errors
that occur when data is transmitted from one computer to another,
software bugs or viruses, hardware malfunctions (disk crashes), and