HP EH890–90900 Technical Reference Manual page 40

groups. On the other hand, infinite flush means that data can remain in the buffer
for very long periods of time, and could be lost in the event of a power failure.
LUN Logical Unit Number, by which different logical units within a particular device
can be addressed individually. Each logical unit contains a device server. The
drive provides a SSC device server, typically at LUN 0, and an ADC device
server, typically at LUN 7. Both may be reassigned, for example the ADI
automation controller may reassign the ADC LUN by using the ADC Device
Server configuration mode sub-page. Finally, the drive also provides optional
SMC LUN(s), which may be assigned by an ADI automation controller at the
time of enablement, typically at LUN 1.
SAN Storage Area Network. A dedicated, high-speed network that establishes a direct
connection between storage elements and servers. The hardware that connects
workstations and servers to storage devices in a SAN is referred to as a fabric.
The SAN fabric enables any-server-to-any-storage device connectivity through
the use of Fibre Channel switching technology.
sequential access Sequential access devices store data sequentially in the order in which it is
received. Tape devices are the most common sequential access devices. Devices
such as disk drives are direct access devices, where data is stored in blocks, not
necessarily sequentially. Direct access allows speedy retrieval, but is significantly
more costly.
40 Glossary