User Manual

SCSI Commands Reference Manual, Rev. J 404
www.seagate.com Parameters for direct access devices
The PS bit, SPF bit, PAGE CODE field, SUBPAGE CODE field, and PAGE LENGTH field are described in 5.3.5.
TCMOS (Timestamp Changeable By Methods Outside this manual) bit
1 A timestamp changeable by methods outside this manual (TCMOS) bit set to one specifies that the timestamp may be initialized by
methods outside the scope of this manual.
0 A TCMOS bit set to zero specifies that the timestamp shall not be changed by any method except those defined by this manual.
SCSIP (SCSI precedence) bit
1 A SCSI precedence (SCSIP) bit set to one specifies that the timestamp changed using a SET TIMESTAMP command shall take precedence
over methods outside the scope of this manual.
0 A SCSIP bit set to zero specifies that methods outside this manual may change the timestamp and that the SET TIMESTAMP command is
illegal.
IALUAE (Implicit Asymmetric Logical Unit Access Enabled) bit
1 An Implicit Asymmetric Logical Unit Access Enabled (IALUAE) bit set to one specifies that implicit asymmetric logical unit access state
changes are allowed.
0 An IALUAE bit set to zero specifies that implicit asymmetric logical unit access state changes be disallowed and indicates that implicit
asymmetric logical unit access state changes are disallowed or not supported.
INITIAL COMMAND PRIORITY field
The INITIAL COMMAND PRIORITY field specifies the priority that may be used as the task priority (see SAM-5) for tasks received by the logical
unit on any I_T nexus (i.e., on any I_T_L nexus) where a priority has not been modified by a SET PRIORITY command. If a MODE SELECT com-
mand specifies an INITIAL COMMAND PRIORITY value that is different than the current INITIAL PRIORITY, then the device server shall set any pri-
orities that have not be set with a SET PRIORITY command to a value different than the new initial priority value to the new priority. The device
server shall establish a unit attention condition for the initiator port associated with every I_T_L nexus that receives a new priority, with the
additional sense code set to PRIORITY CHANGED.
MAXIMUM SENSE DATA LENGTH field
The MAXIMUM SENSE DATA LENGTH field specifies the maximum number of bytes of sense data the device server shall return in the same
I_T_L_Q nexus transaction as the status. A MAXIMUM SENSE DATA LENGTH field set to zero specifies that there is no limit. The device server
shall not return more sense data bytes in the same I_T_L_Q nexus transaction as the status than the smaller of the length indicated by the:
a) MAXIMUM SENSE DATA LENGTH field; and
b) MAXIMUM SUPPORTED SENSE DATA LENGTH field in the Extended INQUIRY VPD page (see 5.4.9).