User Manual

SCSI Commands Reference Manual, Rev. J 397
www.seagate.com Parameters for direct access devices
5.3.12 Control mode page (0Ah)
The Control mode page (see table 377) provides controls over SCSI features that are applicable to all device types (e.g., task set
management and error logging). If a field in this mode page is changed while there is a task already in the task set, it is vendor
specific whether the old or new value of the field applies to that task. The mode page policy (see 3.9) for this mode page shall be
shared, or per I_T nexus.
PS bit, SPF bit, PAGE CODE field, and PAGE LENGTH field
The PS bit, SPF bit, PAGE CODE field, and PAGE LENGTH field are described in 5.3.5.
TST (task set type) field
A task set type (TST) field specifies the type of task set in the logical unit (see table 378).
Regardless of the mode page policy (see 5.4.14) for the Control mode page, the shared mode page policy shall be applied to the
TST field. If the most recent MODE SELECT changes the setting of this field, then the device server shall establish a unit attention
condition (see SAM-5) for the initiator port associated with every I_T nexus except the I_T nexus on which the MODE SELECT
command was received, with the additional sense code set to MODE PARAMETERS CHANGED.
Table 377 Control mode page
Bit
Byte
7 6 5 4 3 2 1 0
0
PS SPF (0b) PAGE CODE (0Ah)
1
PAGE LENGTH (0Ah)
2
TST TMF_ONLY DPICZ D_SENSE GLTSD RLEC
3
QUEUE ALGORITHM MODIFIER NUAR QERR
DQUE
Obsolete
4
VS RAC UA_INTLCK_CTRL SWP
RAERP
Obsolete
UAAERP
Obsolete
EAERP
Obsolete
5
ATO TAS ATMPE
RWWP Reserved
AUTOLOAD MODE
6
(MSB)
Obsolete formerly
READY AER HOLDOFF PERIOD
7
(LSB)
8
(MSB)
BUSY TIMEOUT PERIOD
9
(LSB)
10
(MSB)
EXTENDED SELF-TEST COMPLETION TIME
11
(LSB)
Table 378 Task set type (TST) field
Code Description
000b
The logical unit maintains one task set for all I_T nexuses
001b
The logical unit maintains separate task sets for each I_T nexus
010b - 111b
Reserved