User Manual

SCSI Commands Reference Manual, Rev. J 398
www.seagate.com Parameters for direct access devices
TMF_ONLY (Allow Task Management Functions Only) bit
0 The allow task management functions only (TMF_ONLY) bit set to zero specifies that the device server shall process tasks with the ACA
task attribute received on the faulted I_T nexus when an ACA condition has been established (see SAM-5).
1 A TMF_ONLY bit set to one specifies that the device server shall terminate all tasks received on the faulted I_T nexus with an ACA ACTIVE
status when an ACA condition has been established.
DPICZ bit
0 A disable protection information check if protect field is zero (DPICZ) bit set to zero indicates that checking of protection information
bytes is enabled.
1 A DPICZ bit set to one indicates that checking of protection information is disabled on commands with:
a) the RDPROTECT field (see SBC-4) set to zero;
b) the VRPROTECT field (see SBC-4) set to zero; or
c) the ORPROTECT field (see SBC-4) set to zero.
D_SENSE (DESCRIPTOR FORMAT SENSE DATA) bit
0 A descriptor format sense data (D_SENSE) bit set to zero specifies that the device server shall return the fixed format sense data when
returning sense data in the same I_T_L_Q nexus transaction as a CHECK CONDITION status.
1 A D_SENSE bit set to one specifies that the device server shall return descriptor format sense data when returning sense data in the
same I_T_L_Q nexus transaction as a CHECK CONDITION status, except as defined in 2.4.1.
GLTSD (Global Logging Target Save Disable) bit
0 A global logging target save disable (GLTSD) bit set to zero specifies that the logical unit implicitly saves, at vendor specific intervals,
each log parameter in which the TSD bit (see 5.2) is set to zero.
1 A GLTSD bit set to one specifies that the logical unit shall not implicitly save any log parameters.
RLEC (Report Log Exception Condition) bit
1 A report log exception condition (RLEC) bit set to one specifies that the device server shall report log exception conditions as described
in 5.2.2.
0 A RLEC bit set to zero specifies that the device server shall not report log exception conditions.
QUEUE ALGORITHM MODIFIER field
The QUEUE ALGORITHM MODIFIER field (see table 379) specifies restrictions on the algorithm used for reordering tasks having the SIMPLE task
attribute (see SAM-5).
A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that the device server shall order the processing sequence of tasks having
the SIMPLE task attribute such that data integrity is maintained for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
requests is halted at any time, the final value of all data observable on the medium shall have exactly the same value as it would have if all the
tasks had been given the ORDERED task attribute).
A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the device server may reorder the processing sequence of tasks having
the SIMPLE task attribute in any manner. Any data integrity exposures related to task sequence order shall be explicitly handled by the applica
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tion client through the selection of appropriate commands and task attributes.
Table 379 QUEUE ALGORITHM MODIFIER field
Code Description
0h
Restricted reordering
1h
Unrestricted reordering allowed
2h - 7h
Reserved
8h - Fh
Vendor specific