Tandem Failure Data System (TFDS) Manual

Glossary
HP Tandem Failure Data System (TFDS) Manual—540122-003
Glossary-3
Event Management Service (EMS)
Event Management Service (EMS). A Distributed Systems Management (DSM) product
that provides event collection, event logging, and event distribution facilities. EMS
provides different event descriptions for interactive and programmatic interfaces, lets
an operator or an application select specific event-message data, and allows for
flexible distribution of event messages within a system or network.
event message. Text intended for a system operator that describes a change in some
condition in the system or network, whether minor or serious. The change of condition
is called an event. Events can be operational errors, notifications of limits exceeded,
requests for actions needed, and so on. See also operator message.
extent. A contiguous area on disk for allocating one file.
extent size. The size in bytes of a contiguous area on disk for allocating one file.
filename. In the Open System Services (OSS) environment, a component of a pathname
containing any valid characters other than slash (/) or null. See also file name.
file name. A string of characters that uniquely identifies a file.
In the PC environment, file names for disk files normally have at least two parts (the
disk name and the file name); for example, B:MYFILE.
In the Guardian environment, disk file names include an Expand node name, volume
name, subvolume name, and file identifier; for example,
\NODE.$DISK.SUBVOL.MYFILE.
In the Open System Services (OSS) environment, a file is identified by a pathname; for
example, /usr/john/workfile. See also filename.
fileset. In the Open System Services (OSS) environment, a set of files with a common
mount point within the file hierarchy. A fileset can be part or all of a single virtual file
system.
On an HP NonStop™ system, the Guardian file system for an Expand node has a
mount point and is a subset of the OSS virtual file system. The entire Guardian file
system therefore could be viewed as a single fileset. However, each volume and each
process of subtype 30 within the Guardian file system is actually a separate fileset.
The term file system is often used interchangeably with fileset in UNIX publications.
file system. In the Open System Services (OSS) environment, a collection of files and file
attributes. A file system provides the namespace for the file serial numbers that
uniquely identify its files. Open System Services provides a file system (see also
ISO/IEC IS 9945-1:1990 [ANSI/IEEE Std. 1003.1-1990], Clause 2.2.2.38); the
Guardian application program interface (API) provides a file system; and OSS Network
File System (NFS) provides a file system. (OSS NFS filenames and pathnames are
governed by slightly different rules than OSS filenames and pathnames.) Within the
OSS and OSS NFS file systems, filesets exist as manageable objects.