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Appendix A Glossary of Terms and Acronyms
472 September 2002 HPSS Installation Guide
Release 4.5, Revision 2
attribute When referring to a managed object, an attribute is one discrete piece of
information, or set of related information, within that object.
attribute change When referring to a managed object, an attribute change is the
modification of an object attribute. This event may result in a notification
being sent to SSM, if SSM is currently registered for that attribute.
audit (security) An operation that produces lists of HPSS log messages whose record type
is SECURITY. A security audit is used to provide a trail of security-
relevant activity in HPSS.
Bar code An array of rectangular bars and spaces in a predetermined pattern (e.g.,
UPC symbol)
BFS Bitfile Server
bitfile A logical string of bits unrestricted in size or internal structure. HPSS
imposes a size limitation in 8-bit bytes based upon the maximum size in
bytes that can be represented by a 64-bit unsigned integer.
bitfile segment An internal metadata structure, not normally visible, used by the Bitfile
Server to map contiguous pieces of a bitfile to underlying storage
provided by a Storage Server.
Bitfile Server An HPSS 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
the Tape Storage Server requires a tape mark 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.
CDS Cell Directory Service
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. Each disk virtual
volume is divided into a number of clusters such that the number is less
than 16384. The smallest amount of disk space that can be allocated from