Availability Guide for Application Design

Glossary
Availability Guide for Application Design—525637-004
Glossary-7
distributor process
monitor and control systems and networks from a single terminal. DSMS is particularly
useful for managing subsystems and their objects.
distributor process. An Event Management Service (EMS) process that distributes event
messages from event logs to requesting management applications, to console
message destinations, to specific processes in the ViewPoint application, or to a
collector on another node. See also Event Management Service (EMS), collector
process, consumer distributor, forwarding distributor, and printing distributor.
DLL. see Dynamic Linked Library.
DNS. See Distributed Name Service (DNS).
down state. A category of object states that includes all states of an object in which the
object cannot provide any useful service. An object is down when it is stopped. A
critical object that transitions to the down state implies the need for reactive recovery.
See also up state, odd state, and unknown state.
downtime. Time during which the NonStop 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 the application is not available. The cost of downtime can be
dramatic in lost revenue, lost consumer confidence, and lost productivity.
DSC. See Dynamic System Configuration (DSC) utility.
DSM. See Distributed Systems Management (DSM) products.
DSM Template Services. An HP product that provides text for tokenized messages.
DSMS. See Distributed Systems Management Solutions (DSMS).
dual-ported. The capability of an I/O controller or peripheral device to receive data and
commands from two sources although only one source has access at any particular
moment. In an HP system, an I/O controller can receive data and commands from two
processors; a peripheral device (usually a disk drive) can receive data and commands
from two disk controllers.
Dynamic Linked Library. A PIC library that offers functions or data for use by other PIC
loadfiles. In UNIX, this type of file is known as a shared object file or dynamic
shared object (DSO).
dynamic loading. Loading and opening DLLs under programmatic control after the
program is loaded and execution has begun.
dynamic server. A server process that the PATHMON process creates after a TCP or link
manager process has waited for a specified time period for a static server to become
available. A dynamic server process exists only as long as it is needed. See also static
server.