Bitfile Service

Portion of the HPSS Core Server that provides a logical abstraction of bitfiles

 

to its clients.

BMUX

Block Multiplexer Channel

bytes between tape marks

The number of data bytes that are written to a tape virtual volume before a

 

tape mark is required on the physical media.

CAP

Cartridge Access Port

cartridge

A physical media container, such as a tape reel or cassette, capable of being

 

mounted on and dismounted from a drive. A fixed disk is technically

 

considered to be a cartridge because it meets this definition and can be

 

logically mounted and dismounted.

central log

The main repository of logged messages from all HPSS servers enabled to

 

send messages to the Log Daemon.

class

A type definition in Java. It defines a template on which objects with similar

 

characteristics can be built, and includes variables and methods specific to the

 

class.

Class of Service

A set of storage system characteristics used to group bitfiles with similar

 

logical characteristics and performance requirements together. A Class of

 

Service is supported by an underlying hierarchy of storage classes.

cluster

The unit of storage space allocation on HPSS disks. The smallest amount of

 

disk space that can be allocated from a virtual volume is a cluster. The size of

 

the cluster on any given disk volume is determined by the size of the smallest

 

storage segment that will be allocated on the volume, and other factors.

configuration

The process of initializing or modifying various parameters affecting the

 

behavior of an HPSS server or infrastructure service.

COS

Class of Service

Core Server

An HPSS server which manages the namespace and storage for an HPSS

 

system. The Core Server manages the Name Space in which files are defined,

 

the attributes of the files, and the storage media on which the files are stored.

 

The Core Server is the central server of an HPSS system. Each storage sub-

 

system uses exactly one Core Server.

daemon

A UNIX program that runs continuously in the background.

DB2

A relational database system, a product of IBM Corporation, used by HPSS to

 

store and manage HPSS system metadata.

debug

A log record message type used to log lower-level error conditions.

DEC

Digital Equipment Corporation.

delog

The process of extraction, formatting, and outputting HPSS central log

 

records.

deregistration

The process of disabling notification to SSM for a particular attribute change.

descriptive name

A human-readable name for an HPSS server.

HPSS Installation Guide

July 2008

Release 6.2 (Revision 2.0)

246

Page 246
Image 246
IBM HPSS manual Hpss Installation Guide July Release 6.2 Revision 246, Bitfile Service