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Appendix A Glossary of Terms and Acronyms
480 September 2002 HPSS Installation Guide
Release 4.5, Revision 2
physical volume An HPSS object managed jointly by the Storage Server and the Physical
Volume Library that represents the portion of a cartridge that can be
contiguously accessed when mounted. A single cartridge may contain
multiple physical volumes.
Physical Volume Library An HPSS server that manages mounts and dismounts of HPSS physical
volumes.
Physical Volume Repository An HPSS server that manages the robotic or human agent responsible for
mounting and dismounting cartridges.
PIOFS Parallel I/O File System
POSIX Portable Operating System Interface (for computer environments)
purge Deletion of file data from a level in the file’s hierarchy after the data has
been duplicated at lower levels in the hierarchy and is no longer needed at
the deletion level.
purge lock A lock applied to a bitfile which prohibits the bitfile from being purged.
PV Physical Volume
PVL Physical Volume Library
PVM Physical Volume Manager
PVR Physical Volume Repository
RAID Redundant Array of Independent Disks
RAIT Redundant Array of Independent Tapes
RAM Random Access Memory
reclaim The act of making virtual volumes that have no active data (i.e., empty)
available for use in storing new data, so that data media can be reused.
registration The process by which SSM requests notification of changes to specified
attributes of a managed object.
reinitialization An HPSS SSM administrative operation that directs an HPSS server to
reread its latest configuration information, and to change its operating
parameters to match that configuration, without going through a server
shutdown and restart.
repack The act of moving data from a virtual volume onto another virtual volume
with the same characteristics (storage class) with the intention of freeing
up all data references to that virtual volume. The act of emptying a virtual
volume of all file data.
request A log record message type used to log some action being performed by an
HPSS server on behalf of a client. The default logging policy is to log
request messages.