Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications page 212

Parameter Data Formats
a. TST (Task Set Type)
This field specifies the type of task set defined below.
Value
000b
001b
010b-111b
The IDD operates according to "000b". If other value is specified in this field, the IDD reports a
"CHECK CONDITION" status (ILLEGAL REQUEST [=5] / Invalid parameter in list [=26-00]).
b. Queue algorithm qualifier
This parameter controls the execution order algorithm of a command issued together with a SIMPLE
QUEUE TAG message.
When "0" is specified in this parameter, the IDD may change the queued command execution order
in order to achieve the best performance.
The commands that may be reordered are:
Read, Read Extend, Write, Write Extend.
In case the commands whose specified LBAs are overlapped, the order of the commands in question
are kept to ensure the Data Integrity.
When "1" is specified in this parameter, the IDD may change the queued command execution order
in order to achieve the best performance.
The commands that may be reordered are:
Read, Read Extend, Write, Write Extend.
Despite the commands whose specified LBAs are overlapped, the IDD conducts reordering
operation. Therefore the INIT who specifies "1" in this field shall ensure Data Integrity itself. The
IDD disregards "1" in this field and operates as if "0" were specified.
When "F" is specified in this parameter, the IDD prohibits to order queued commands.
When other value is specified in this parameter, the IDD reports a CHECK CONDITION status
(ILLEGAL REQUEST [=5] / Invalid parameter in List [=26-00]).
c. GLTSD (Global Logging Target Save Disable) (not supported)
This bit specifies whether or not to permit the saving treatment of peculiar logging parameter within
the IDD.
Since the IDD performs the saving treatment with itself algorithm regardless of specified value in
this bit, disregards the specification in this bit.
4-28
Description
Task set per logical unit for all initiators
Task set per initiator per logical unit
Reserved
C141-C010