User Manual

SCSI Commands Reference Manual, Rev. J 501

www.seagate.com Parameters for direct access devices

POLICY PAGE CODE field and POLICY SUBPAGE CODE field

The POLICY PAGE CODE field and POLICY SUBPAGE CODE field indicate the mode page and subpage to which the descriptor applies.

If the first mode page policy descriptor in the list contains a POLICY PAGE CODE field set to 3Fh and a POLICY SUBPAGE CODE field set to FFh,

then the descriptor applies to all mode pages and subpages not described by other mode page policy descriptors. The POLICY PAGE CODE

field shall be set to 3Fh and the POLICY SUBPAGE CODE field shall be set to FFh only in the first mode page policy descriptor in the list.

If the POLICY PAGE CODE field contains a value other than 3Fh and a POLICY SUBPAGE CODE field contains a value other than FFh, then the

POLICY PAGE CODE field and the POLICY SUBPAGE CODE field indicate a single mode page and subpage to which the descriptor applies.

If the POLICY PAGE CODE field contains a value other than 3Fh, then POLICY SUBPAGE CODE field shall contain a value other than FFh. If the

POLICY SUBPAGE CODE field contains a value other than FFh, then POLICY PAGE CODE field shall contain a value other than 3Fh.

MLUS bit

If the SCSI target device has more than one logical unit:

1 A multiple logical units share (MLUS) bit set to one indicates the mode page and subpage identified by the POLICY PAGE CODE field and

POLICY SUBPAGE CODE field is shared by more than one logical unit.

0 A MLUS bit set to zero indicates the logical unit maintains its own copy.

The MLUS bit is set to one in the mode page policy descriptors or descriptor that indicates the mode page policy for the:

a) Disconnect-Reconnect mode page (see 5.3.14) for FC, and (see 5.3.15) for SAS and;

b) Protocol Specific Port mode page (see 5.3.26).

MODE PAGE POLICY field

The MODE PAGE POLICY field (see table 474) indicates the mode page policy for the mode page and subpage identified by the POLICY PAGE

CODE field and POLICY SUBPAGE CODE field.

Table 474 MODE PAGE POLICY field

Code Description

00b Shared

01b Per target port

10b Obsolete

11b Per I_T nexus