User Manual

SCSI Commands Reference Manual, Rev. J 25
www.seagate.com Definitions, Symbols, Abbreviations, Keywords, And Conventions
1.1 Definitions
Access control list (ACL)
The data used by a SCSI target device to configure access rights for initiator ports according to the access controls state of the SCSI target
device.
Access control list entry (ACE)
One entry in the access control list.
Access controls
An optional SCSI target device feature that restricts initiator port access to specific logical units and modifies the information about logical
units in the parameter data of the INQUIRY and REPORT LUNS commands.
Access controls coordinator
The entity within a SCSI target device that coordinates the management and enforcement of access controls for all logical units within the SCSI
target device. The access controls coordinator is always addressable through the ACCESS CONTROLS well known logical unit and LUN 0.
active power condition
When a device server is capable of responding to all of its supported commands, including media access requests, without delay.
additional sense code
A combination of the ADDITIONAL SENSE CODE and ADDITIONAL SENSE CODE QUALIFIER fields in the sense data.
Application client
An object that is the source of SCSI commands. Further definition of an application client may be found in SAM-5.
Attribute
A single unit of MAM information.
Auto contingent allegiance (ACA)
The task set condition established following the return of a CHECK CONDITION status when the NACA bit is set to one in the CONTROL byte. A
detailed definition of ACA may be found in Clause 2.2.7.
Blocked task
A task that is in the blocked state. Tasks become blocked when an ACA condition occurs. The blocked state ends when the ACA condition is
cleared. A detailed definition of the blocked task state may be found in SAM-5.
Byte
A sequence of eight contiguous bits considered as a unit.
Cache
See cache memory.
Cache memory
A temporary and often volatile data storage area outside the area accessible by application clients that may contain a subset of the data stored
in the non-volatile data storage area.
Check data
Information contained within a redundancy group that may allow lost or destroyed XOR-protected data to be recreated.
Command
A request describing a unit of work to be performed by a device server. A detailed definition of a command may be found in SAM-5.
Command descriptor block (CDB)
The structure used to communicate commands from an application client to a device server. A CDB may have a fixed length of up to 16 bytes or
a variable length of between 12 and 260 bytes.
Command standard
A SCSI standard that defines the model, commands, and parameter data for a device type (e.g., SBC-4, SSC-3, SMC-3, MMC-5, or SES-3).
Company_id
Synonym for OUI.
Copy manager
The device server that receives an EXTENDED COPY command and performs the operation requested.