NonStop S-Series System Expansion and Reduction Guide

Table Of Contents

Glossary

G-Series Common Glossary

Glossary-24

directory tree

directory tree. A hierarchy of directories. In the Open System Services (OSS) environment,

directories are connected to each other in a branching hierarchical fashion such that

only one path exists between any two directories (if no backtracking occurs).

disconnecting means. A device, group of devices, or other means by which the conductors

of a circuit can be disconnected from their source of supply.

discovery. For the OSM and TSM client software, the process of identifying the resources

that exist on an HP NonStop™ S-series server. See also incremental discovery

and

initial discovery

disk bootstrap. A software entity residing on disk that is used to load the HP NonStop™

Kernel operating system image (OSIMAGE) into memory during a system load. A disk

that contains the disk bootstrap is referred to as a bootable disk. The disk bootstrap is

placed on the disk either as part of a tape load or as a result of the SCF CONTROL

DISK, REPLACEBOOT command.

disk cache. A temporary storage buffer into which data is read, retained, and perhaps

updated before being written to disk, for more efficient processing.

disk drive. A device that stores and accesses data on a magnetic disk. Random access to

addressable locations on a magnetic disk is provided by magnetic read/write heads.