NonStop S-Series Planning and Configuration Guide (G06.25+)

Glossary
HP NonStop S-Series Planning and Configuration Guide—523303-015
Glossary-25
DLC
DLC. See data link control (DLC).
DNS. See Domain Name System (DNS).
DNS server. A server that resolves hostnames to Internet protocol (IP) address mapping
queries. These queries originate from either client computers, which are known as
resolvers, or other Domain Name System (DNS)
servers, which accounts for the
distributed nature of DNS. See also Network Information Service (NIS)
.
domain. (1) In the Internet, a part of the naming hierarchy. Syntactically, a domain name
consists of a sequence of names (labels) separated by periods (dots).
(2) In a NonStop S-series server, a pair of service processors, the associated router
clouds, and the attached replaceable units.
(3) A set of objects over which control or ownership is maintained. Types of domains
include power domains and service processor (SP) domains.
Domain Name System (DNS). A system that defines a hierarchical, yet distributed,
database of information about hosts on a network. The network administrator
configures the DNS with a list of hostnames and Internet protocol (IP) addresses,
allowing users of workstations that are configured to query the DNS to specify remote
systems by hostnames rather than by IP addresses. DNS domains should not be
confused with Windows NT networking domains. See also DNS server
, Network
Information Service (NIS), and ping.
donor system. The computer system you make smaller by removing enclosures, either to
reduce the system or to add the removed enclosures to another target system
, using a
process known as system reduction.
double-high ServerNet adapter. A ServerNet adapter that occupies an entire ServerNet
adapter slot in an HP NonStop™ S-series server. Contrast with single-high ServerNet
adapter.
double-high stack. A stack that includes a base, a frame, and two system enclosures.
Contrast with single-high stack
.
double-wide plug-in card (PIC). A large-form-factor plug-in card (PIC) that occupies two
adjacent PIC slots within a customer-replaceable unit (CRU). See also single-wide
plug-in card (PIC).
download. The process of transferring software from one location to another, where the
transferring entity initiates the transfer.
download line task. Any task running under the Portable Silicon Operating System (pSOS)
system product, such as a data protocol.
downtime. Time during which a computer system is not capable of doing useful work
because of a planned or unplanned outage. From the end user’s perspective,
downtime is any time a needed application is not available.