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Appendix A Glossary of Terms and Acronyms
HPSS Installation Guide September 2002 483
Release 4.5, Revision 2
between the System Manager and the GUI, and (3) the GUI itself, which
includes the Sammi Runtime Environment and the set of SSM windows.
stripe length The number of bytes that must be written to span all the physical storage
media (physical volumes) that are grouped together to form the logical
storage media (virtual volume). The stripe length equals the virtual
volume block size multiplied by the number of physical volumes in the
stripe group (i.e., stripe width).
stripe width The number of physical volumes grouped together to represent a virtual
volume.
System Manager A Storage System Management (SSM) server that communicates with all
other HPSS components requiring monitoring or control.
TB Terabyte (2
40
)
TCP/IP Transmission Control Protocol/Internet Protocol
trace A log record message type used to record entry/exit processing paths
through HPSS server software. The default logging policy is to not log
trace message types.
transaction A programming construct that enables multiple data operations to possess
the following properties:
All operations commit or abort/roll-back together such that they form a
single, atomic unit of work.
All data modified as part of the same transaction are guaranteed to
maintain a consistent state whether the transaction is aborted or
committed.
Data modified from one transaction are isolated from other transactions
until the transaction is either committed or aborted.
Once the transaction commits, all changes to data are guaranteed to be
permanent.
TTY Teletypewriter
UDP User Datagram Protocol
UID User Identifier
UPC Universal Product Code
UUID Universal Unique Identifier
virtual volume An HPSS object managed by the Storage Server that is used to represent
logical media. A virtual volume is made up of a group of physical storage
media (a stripe group of physical volumes).
virtual volume block size The size of the block of data bytes that is written to each physical volume