Compaq 4200 Family - Manual (Page 53)

GL–4 Enclosure 4200 Family LVD Disk Enclosures User Guide
SCSI ID (1.) The bit-significant representation of the SCSI addressing referring to
one of the signal lines numbered 0 through 7 for an 8-bit bus or 0 through
15 for a 16-bit bus. Also referred to as “target ID”. (2.) The unique device
identification number assigned to each target or initiator on a single SCSI
bus. The valid address range for a wide bus is 0 through 15.
spin-up The process that begins when power is applied to a storage drive, and
ends when the drive is determined to be operational and ready for data
transfer operations.
StorageWorks The Compaq set of enclosure products that allows customers to design
and configure their own storage subsystem. Elements include power,
packaging, and interconnections in a StorageWorks enclosure. Storage
devices, power supplies, I/O modules, EMUs, and array controllers may
be integrated therein to form storage subsystems. System-level enclosures
to house the enclosures are also included.
terminator Interconnect elements that form the ends of the transmission lines in bus
segments. A SCSI domain must have at least one segment and therefore at
least two terminators, except for special cases where the electrical
transmission lines are very short and only one termination or pull–up is
required.
tower A freestanding, floor mounted unit containing a disk enclosure in the
vertical orientation. This unit can function as a stand-alone storage
subsystem.
units The modular unit “U” on which panel heights is based on the vertical
RETMA mounting pattern of 1.750 inches (44.45 mm). (Per EIA
Standard RS-310-C.)
VHDCI Very High Density Computer Interconnect. A 68-pin interface with
connectors on 0.8 mm centers. Required for Wide-Ultra2 SCSI
configurations.
Wide-Ultra SCSI A SCSI bus that can operate either as an LVD or SE bus. This bus
transfers data at rates up to 40 MB/s when using the LVD protocol. When
using SE the maximum transfer rate is 20 MB/s.
Wide-Ultra2 SCSI A wide SCSI bus that transfers data at rates up to 80 MB/s when
operating using the LVD protocol. There is no provision for this bus to
operate in the narrow mode.