User Manual

SCSI Commands Reference Manual, Rev. J 484
www.seagate.com Parameters for direct access devices
SPT (Supported Protection Type) field
A supported protection type (SPT) field (see table 457) indicates the type of protection the logical unit supports. The SPT field shall be ignored
if the PROTECT bit is set to zero.
GRD_CHK (Guard Check) bit
0 A guard check (GRD_CHK) bit set to zero indicates that the device server does not check the LOGICAL BLOCK GUARD field in the protec-
tion information (see SBC-4), if any.
1 A GRD_CHK bit set to one indicates that the device server checks the LOGICAL BLOCK GUARD field in the protection information, if any.
APP_CHK (Application Tag Check) bit
0 An application tag check (APP_CHK) bit set to zero indicates that the device server does not check the LOGICAL BLOCK APPLICATION
TAG field in the protection information (see SBC-4), if any.
1 An APP_CHK bit set to one indicates that the device server checks the LOGICAL BLOCK APPLICATION TAG field in the protection informa-
tion, if any.
REF_CHK (Reference Tag Check) bit
0 A reference tag check (REF_CHK) bit set to zero indicates that the device server does not check the LOGICAL BLOCK REFERENCE TAG field
in the protection information (see SBC-4), if any.
1 A REF_CHK bit set to one indicates that the device server checks the LOGICAL BLOCK REFERENCE TAG field in the protection information,
if any.
Table 456 ACTIVATE MICROCODE field
Value Meaning
00b
The actions of the device server may or may not be as defined for values 01b or 10b.
01b
The device server:
1) activates the microcode before completion of the final command in the WRITE BUFFER sequence; and
2) establishes a unit attention condition for the initiator port associated with every I_T nexus, except the
I_T nexus on which the WRITE BUFFER command was received, with the additional sense code set to
MICROCODE HAS BEEN CHANGED.
10b
The device server:
1) activates the microcode after:
A) a vendor specific event;
B) a power on event; or
C) a hard reset event;
and
2) establishes a unit attention condition for the initiator port associated with every I_T nexus with the
additional sense code set to MICROCODE HAS BEEN CHANGED.
11b
Reserved.
Table 457 SPT field
Code Definition
000b
The logical unit supports type 1 protection (see SBC-4).
001b
The logical unit supports type 2 protection (see SBC-4).
010b
Reserved
011b
The logical unit supports type 3 protection (see SBC-4).
100b - 111b
Reserved