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Appendix A Glossary of Terms and Acronyms
478 September 2002 HPSS Installation Guide
Release 4.5, Revision 2
Metadata Manager The subsystem/component within HPSS responsible for the physical
storage and management of HPSS metadata as well as the transactional
mechanisms for manipulating HPSS meta data. The current Metadata
Manager for HPSS is the Encina SFS product, together with a set of HPSS-
developed application program interfaces (APIs) that provide a layer of
abstraction on top of the Encina SFS data access methods.
Metadata Monitor A type of HPSS server that is responsible for monitoring the space
utilization of a single Encina SFS process. The Metadata Monitor calculates
the overall amount of disk space being used by SFS and generates alarms
to SSM as appropriate whenever various thresholds are exceeded.
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.
mirrored fileset A DFS fileset whose files are mirrored on HPSS. These files appear in both
the DFS and HPSS name spaces, and so users can access the files from
either place.
MM Metadata Manager
MMON Metadata Monitor
mount An operation in which a cartridge is either physically or logically made
readable and/or writable on a drive. In the case of tape cartridges, a
mount operation is a physical operation. In the case of a fixed disk unit, a
mount is a logical operation.
mount point A place where a fileset is mounted in the DFS and/or HPSS name spaces.
Mount Daemon An HPSS server object responsible for performing mount request
operations for client systems accessing HPSS data through the HPSS
Network File System (NFS) Daemon.
Mover An HPSS server that provides control of storage devices and data transfers
within HPSS.
MPS Migration/Purge Server
MRA Media Recovery Archive
MSSRM Mass Storage System Reference Model
MVR Mover
NASA National Aeronautics and Space Administration
Name Server An HPSS server that provides a mapping between names and machine-
oriented identifiers. In addition, the Name Server performs access