User Manual

SCSI Commands Reference Manual, Rev. J 408
www.seagate.com Parameters for direct access devices
5.3.15 Disconnect-Reconnect mode page (02h) for SAS
The Disconnect-Reconnect mode page for SAS provides the application client the means to tune the performance of the service
delivery subsystem. Table 385 defines the parameters which are applicable to SSP. If any field in the Disconnect-Reconnect mode
page is not implemented, the value assumed for the functionality of the field shall be zero (i.e., as if the field in the mode page is
implemented and the field is set to zero).
The application client sends the values in the fields to be used by the device server to control the SSP connections by means of a
MODE SELECT command. The device server shall then communicate the field values to the SSP target port. The field values are
communicated from the device server to the SSP target port in a vendor-specific manner.
SAS devices shall only use the parameter fields defined below in Table 385. If any other fields within the Disconnect-Reconnect
mode page of the MODE SELECT command contain a non-zero value, the device server shall terminate the MODE SELECT
command with CHECK CONDITION status with the sense key set to ILLEGAL REQUEST and the additional sense code set to
INVALID FIELD IN PARAMETER LIST.
The PARAMETERS SAVEABLE (PS) bit is defined in 5.3.5.
The PAGE CODE (PS) field shall be set to 02h.
The PAGE LENGTH field shall be set to 0Eh.
Table 385 Disconnect-Reconnect mode page for SAS
Bit
Byte
7 6 5 4 3 2 1 0
0
PS SPF (0b) PAGE CODE (02h)
1
PAGE LENGTH (0Eh)
2
Reserved
3
Reserved
4
(MSB)
BUS INACTIVITY TIME LIMIT
5
(LSB)
6
Reserved
7
8
(MSB)
MAXIMUM CONNECT TIME LIMIT
9
(LSB)
10
(MSB)
MAXIMUM BURST SIZE
11
(LSB)
12
Restricted
13
Reserved
14
(MSB)
FIRST BURST SIZE
15
(LSB)