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 | The Storage System Management (SSM) server. It communicates with all |
| other HPSS components requiring monitoring or control. It also |
| communicates with the SSM graphical user interface (hpssgui) and command |
| line interface (hpssadm). |
TB | Terabyte (240) |
TCP/IP | Transmission Control Protocol/Internet Protocol |
trace | A log record message type used to record entry/exit processing paths through |
| HPSS server software. |
transaction | A programming construct that enables multiple data operations to possess the |
| following properties: |
| All operations commit or |
| 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 Core 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 of a |
| striped virtual volume before switching to the next physical volume. |
VV | Virtual Volume |
XDSM | The Open Group’s Data Storage Management standard. It defines APIs that |
| use events to notify Data Management applications about operations on files. |
XFS | A file system created by SGI available as open source for the Linux operating |
| system. |
HPSS Installation Guide | July 2008 |
Release 6.2 (Revision 2.0) | 254 |
