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hot-swap
A method of device replacement whereby the complete system remains on line
and active during device removal or insertion. The device being removed or
inserted is the only device that cannot perform operations during this process.
User applications that are not dependent upon the device being swapped are not
impacted.
See also cold-swap and warm-swap.
logical bus
A single-ended, physical bus connected to a differential, physical bus by a SCSI
bus signal converter.
physical bus
Two SCSI terminators separated by a cables, connectors, and backplane circuitry.
RAID
Redundant Array of Independent Disks
SBB
StorageWorks building block. The basic building block of the StorageWorks
product line. Any device conforming to shelf mechanical and electrical standards
installed in either a 3½-inch or 5¼-inch carrier is considered to be an SBB,
whether it be a storage device, a power supply, or other device.
SBB shelf
The common name for any StorageWorks shelf that contains only power supply
and storage SBBs.
SCSI
Small Computer System Interface. This ANSI interface defines the physical
and electrical parameters of a parallel I/O bus used to connect computers and a
maximum of seven devices. The StorageWorks subsystem implementation uses
SCSI–2, for the synchronous transfer of 8-bit data at rates of up to 10 MB/s.
SCSI bus signal converter
Sometimes referred to as an adapter. (1) A connecting device that permits the
attachment of accessories or provides the capability to mount or link units. (2)
The device that connects a 16-bit, differential SCSI bus operating in the 8-bit
mode to an 8-bit, single-ended SCSI bus.
SCSI busing connection
A connection in the SCSI bus between two terminators such as the SBB shelf
SCSI input connector.
SCSI device
A host computer adapter, a peripheral controller, or an intelligent peripheral that
can be attached to the SCSI bus.
SCSI device ID
The bit-significant representation of the SCSI addressing referring to one of the
signal lines numbered 0 through 7. Also referred to as target ID.
Glossary–3