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13-2
Definitions of Terms
active I/O
process
An I/O process that is presently in execution (not queued).
byte:
This term indicates an 8-bit construct
connection
An initial connection or reconnection. A connection can only
occur between one initiator and one target.
current I/O
process
The I/O process that is presently connected on the SCSI bus.
disconnect
The action that occurs when an SCSI device releases control
of the SCSI bus, allowing it to go to the BUS FREE phase
host adapter
A device which connects between a host system and the SCSI
bus. The device usually performs the lower layers of the SCSI
protocol and normally operates in the initiator role. This
function may be integrated into the host system.
initiator
A SCSI device that requests an I/O process to be performed by
another SCSI device (a target).
I/O process
An I/O process consists of one initial connection and zero or
more reconnections, all pertaining to a single command or a
group of linked commands. More specifically, the
connection(s) pertain to a nexus in which zero or more
command descriptor blocks are transferred. An I/O process
begins with the establishment of a nexus. An I/O process
normally ends with the BUS FREE phase following successful
transfer of a COMMAND COMPLETE or a RELEASE
RECOVERY message. An I/O process also ends with the
BUS FREE phase following an ABORT, ABORT TAG, BUS
DEVICE RESET, CLEAR QUEUE message, or a hard