Appendix A Glossary of Terms and AcronymsHPSS Installation Guide September 2002 483Release 4.5, Revision 2between the System Manager and the GUI, and (3) the GUI itself, whichincludes 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 storagemedia (physical volumes) that are grouped together to form the logicalstorage media (virtual volume). The stripe length equals the virtualvolume block size multiplied by the number of physical volumes in thestripe group (i.e., stripe width).stripe width The number of physical volumes grouped together to represent a virtualvolume.System Manager A Storage System Management (SSM) server that communicates with allother HPSS components requiring monitoring or control.TB Terabyte (240)TCP/IP Transmission Control Protocol/Internet Protocoltrace A log record message type used to record entry/exit processing pathsthrough HPSS server software. The default logging policy is to not logtrace message types.transaction A programming construct that enables multiple data operations to possessthe following properties:All operations commit or abort/roll-back together such that they form asingle, atomic unit of work.All data modified as part of the same transaction are guaranteed tomaintain a consistent state whether the transaction is aborted orcommitted.Data modified from one transaction are isolated from other transactionsuntil the transaction is either committed or aborted.Once the transaction commits, all changes to data are guaranteed to bepermanent.TTY TeletypewriterUDP User Datagram ProtocolUID User IdentifierUPC Universal Product CodeUUID Universal Unique Identifiervirtual volume An HPSS object managed by the Storage Server that is used to representlogical media. A virtual volume is made up of a group of physical storagemedia (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
