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Glossary
SCSI device
A host computer adapter, a peripheral array controller or an intelligent
peripheral that can be attached to the SCSI bus.
SCSI domain
A SCSI domain is a logical bus consisting of at least one bus
segment, at least one initiator, and at least one target. Domains with
multiple bus segments are enabled through the use of bus extenders.
Domains are limited by device addressability. Domains are limited to
a maximum of 16 initiators and targets without the use of LUN
bridges.
SCSI ID
See SCSI bus ID.
SCSI port
(1) Software. The channel that controls communications to and from
a specific SCSI bus in the system. (2) Hardware. The name of the
logical socket at the back of the system unit to which a SCSI device is
connected.
shelf power supply
A power supply that provides +5 V dc and +12 V dc to the
StorageWorks shelves. These power supplies convert either an ac
input (120 V ac) or dc (48 V dc) voltage into the required output
voltages.
single-ended SCSI bus
A bus in which the voltage of a single wire in relation to ground
determines each signal's logic level.
small computer system interface
See SCSI.
spin-down
A process that begins when power is removed from a storage device
and data transfer halts, and ends when the device is stopped and can
be moved. In the case of disk drives, the heads are retracted and the
media is stopped.
UltraSCSI RAID Enclosure Glossary–13
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