User Manual

SCSI Commands Reference Manual, Rev. J 31
www.seagate.com Definitions, Symbols, Abbreviations, Keywords, And Conventions
Sense data
Data describing an error or exceptional condition that a device server delivers to an application client in the same I_T_L_Q nexus transaction as
a CHECK CONDITION status or in response to a REQUEST SENSE command. The format of sense data is defined in SPC-5.
Sense key
The contents of the SENSE KEY field in the sense data.
Service action
A request describing a unit of work to be performed by a device server. A service action is an extension of a command.
Service delivery subsystem
That part of a SCSI I/O system that transmits service requests to a logical unit or SCSI target device and returns logical unit or SCSI target device
responses to a SCSI initiator device.
Standby power condition
When a device server is capable of accepting commands, but not capable of processing media access commands.
Status
One byte of response information sent from a device server to an application client upon completion of each command.
Storage array controller
Any combination of an initiator and application clients (see SAM-5) that originates SCSI commands, converts input LUNs to output LUNs, and
converts input LBAs to output LBAs. A storage array controller organizes a group of direct-access block devices into various objects (e.g., redun-
dancy groups and volume sets). See SCC-2.
System
One or more SCSI domains operating as a single configuration.
Target device name
A SCSI device name of a SCSI target device or of a SCSI target/initiator device when operating as a SCSI target device.
Target port
Synonymous with SCSI target port.
Target port asymmetric access state
The characteristic that defines the behavior of a target port and the allowable command set for a logical unit when commands and task man-
agement functions are routed through the target port maintaining that state.
Target port group
A set of target ports that are in the same target port asymmetric access state at all times.
Target port group asymmetric access state
The target port asymmetric access state common to the set of target ports in a target port group.
Target port identifier
A value by which a SCSI target port is referenced within a SCSI domain.
Target port name
A SCSI port name of a SCSI target port or of a SCSI target/initiator port when operating as a SCSI target port.
Task
An object within a logical unit that represents the work associated with a command or a group of linked commands. A detailed definition of a
task may be found in SAM-5.
Task set
A group of tasks within a logical unit, whose interaction is dependent on the task management (queuing) and ACA rules. See SAM-5 and the
Control mode page.
TCP port numbers
One of the data needed to establish a TCP connection. TCP port numbers may be assigned to protocols that layer on TCP by the Internet
Assigned Numbers Authority. The Internet Assigned Numbers Authority maintains a list of TCP port number assignments at
http://www.iana.or
g/assignments/ port-numbers.
Third-party command
A command sent to one SCSI device requesting than an operation be performed involving two other SCSI devices (e.g., the EXTENDED COPY
command may perform copy operations between two or more SCSI devices none of which are the SCSI device to which the EXTENDED COPY
command was sent).