Guardian User's Guide

Glossary
Guardian User’s Guide—425266-001
Glossary-4
disk
disk. A physical disk pack mounted on a disk drive. Because they are electromechanical
devices, disks are more subject to hardware faults and media errors than other system
components and should therefore be monitored frequently. See also volume.
Disk Compression Program (DCOM). A utility program that compresses disk space.
Disk Space Analysis Program (DSAP). A utility program that analyzes displays how space
is used on a given disk volume.
Distributed Systems Management (DSM) products. A set of software tools that facilitate
management of NonStop™ Kernel systems and Expand networks. These tools include
the Distributed Name Service (DNS), the Event Management Service (EMS), the
Subsystem Control Facility (SCF) for a variety of subsystems, and the Subsystem
Programmatic Interface (SPI).
distributor process. An EMS process that distributes event messages from event logs to
requesting management applications, to another collector on this or another node, or to
printers, devices, or files. EMS provides the following distributor processes for handling
event messages: consumer, forwarding, printing, and compatibility.
DSAP. See Disk Space Analysis Program (DSAP).
DSM. See Distributed Systems Management (DSM) products.
E1SA. See Ethernet 1 ServerNet adapter (E1SA).
EMS. See Event Management Service (EMS).
EMSA. See Event Management Service Analyzer (EMSA).
Error. A utility program that displays the error message associated with a file-system error
number.
Ethernet. A local area network that uses the CSMA/CD (carrier sense multiple access with
collision detection) access method on a bus topology and is the basis for the IEEE 802.3
standard.
Ethernet 1 ServerNet adapter (E1SA). A ServerNet adapter for Ethernet local area network
(LAN) that contains one Ethernet port.
event. A change in some condition in the system or network, whether minor or serious.
Events might be operational errors, notifications of limits exceeded, requests for action,
and so on.
event log. A file or set of files maintained by EMS to store event messages generated by
various subsystems.
Event Management Service (EMS). The processes, procedures, and utilities used to report
and log events; to forward, print, and distribute event messages to applications; and to
filter, retrieve, and obtain information from event messages.