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13-3
RESET condition, or an unexpected disconnect occurs.
logical unit
A physical or virtual peripheral device addressable through a
target.
logical unit
number
An encoded three-bit identifier for the logical unit.
peripheral
device
A physical peripheral device that can be attached to an SCSI
device, which connects to the SCSI bus. The peripheral
device and the SCSI device (peripheral controller) may be
physically packaged together. Often there is a one-to-one
mapping between peripheral devices and logical units, but this
is not required. Examples of peripheral devices are: magnetic
disks, printers, optical disks, and magnetic tapes.
queue tag
The value associated with an I/O process that uniquely
identifies it from other queued I/O processes in the logical
unit for the same initiator.
reconnection
A reconnection is the result of a reconnect and it exists from
the assertion of the BSY signal in a SELECTION or
RESELECTION phase until the next BUS FREE phase
occurs.
SCSI address
The hex representation of the unique address (0-15) assigned
to an SCSI device. This address would normally be assigned
and set in the SCSI device during system installation.
SCSI ID
The bit-significant representation of the SCSI address
referring to one of the signal lines dB(7-0).
SCSI device
A host adapter or a target controller that can be attached to
the SCSI bus.
target
An SCSI device that performs an operation requested by an
initiator.