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local log
An optional circular log maintained by a Log Client. The central log contains
formatted messages from all enabled HPSS servers residing on the same node as
the Log Client.
Location Server
An HPSS server that is used to help clients locate the appropriate Core Server
and/or other HPSS server to use for a particular request.
Log Client
An HPSS server executing on each HPSS node that is responsible for sending
log messages to the local log, to the Log Daemon for central logging, and to
SSM to display messages in the Alarm and Event window.
Log Daemon
An HPSS server responsible for writing log messages to the central log.
log record
A record received and maintained in a central log by the HPSS Log Daemon.
log record type
An indicator of whether a message to be logged is an alarm, event, status, debug,
request, security, or accounting record.
logging service
An HPSS infrastructure service consisting of a central Log Daemon, one or more
Log Clients, and server-specific logging policies.
LRU
Least Recently Used
LS
Location Server
LTO
Linear Tape-Open. A half-inch open tape technology developed by IBM, HP and
Seagate.
MAC
Mandatory Access Control
managed object
A programming data structure that represents an HPSS system resource. The
resource can be monitored and controlled by operations on the managed object.
Managed objects in HPSS are used to represent servers, drives, storage media,
jobs, and other resources.
MB
Megabyte (220)
metadata
Control information about the data stored under HPSS, such as location, access
times, permissions, and storage policies. Most HPSS metadata is stored in a
DB2 relational database.
method
A Java function or subroutine
migrate
To copy file data from a level in the file’s hierarchy onto the next lower level in
the hierarchy.
Migration/Purge Server
An HPSS server responsible for supervising the placement of data in the storage
hierarchies based upon site-defined migration and purge policies.
MM
Metadata Manager. A software library that provides a programming API to
interface HPSS servers with the DB2 programming environment.
HPSS Management Guide November 2009
Release 7.3 (Revision 1.0) 378