6760 ServerNet/DA Manual

Glossary
6760 ServerNet/DA Manual—424879-003
Glossary-12
Class-3 CRU
Class-3 CRU. A customer-replaceable unit (CRU) that probably will cause a partial or total
system outage if the documented replacement procedure is not followed correctly.
Customers replacing Class-3 CRUs should have either six or more months of
experience with replacing HP NonStop™ S-series CRUs or equivalent training.
Customers must be able to use the tools needed for the replacement procedure, must
protect components from electrostatic discharge (ESD), and must understand the
dependencies involved in NonStop S-series CRU-replacement procedures, such as
disk-path switching. Replacement by a service provider trained by HP is
recommended.
client. A software process, hardware device, or combination of the two that requests
services from a server. Often, the client is a process residing on a programmable
workstation and is the part of an application that provides the user interface. The
workstation client might also perform other portions of the application logic.
client application. An application that requests a service from a server application.
Execution of remote procedure calls is an example of a client application.
CLIP. See communications line interface processor (CLIP).
cluster. (1) A collection of servers, or nodes, that can function either independently or
collectively as a processing unit. See also ServerNet cluster
. (2) A term used to
describe a system in a Fiber Optic Extension (FOX) ring. More specifically, a FOX
cluster is a collection of processors and I/O devices functioning as a logical group. In
FOX nomenclature, the term is synonymous with system or node.
cluster number. A number that uniquely identifies a node in a Fiber Optic Extension (FOX)
ring. This number is in the range 1 through 14. See also node number
.
cluster switch. See HP NonStop™ Cluster Switch.
cluster switch enclosure. An enclosure provided by HP for housing the subcomponents of
an HP NonStop™ Cluster Switch, which include the ServerNet II Switch, the AC
transfer switch, and the uninterruptible power supply (UPS). A cluster switch enclosure
resembles, but is half the height of, a standard HP NonStop S-series system
enclosure.
CME. See correctable memory error (CME).
CMI. See Communications Management Interface (CMI).
code segment. A segment that contains program instructions to be executed plus related
information. Code segments cannot be altered by an application program; they are
read from disk but never written back to disk.
code set. Codes that map a unique numeric value to each character in a character set,
using a designated number of bits to represent each character. Single-byte code sets
use 7 or 8 bits to represent each character. The ASCII and ISO 646 code sets use 7
bits to represent each character in Roman-based alphabets; these code sets are very