User Manual

SCSI Commands Reference Manual, Rev. J 121
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
PTPL_C (Persist Through Power Loss Capable) bit
1 A Persist Through Power Loss Capable (PTPL_C) bit set to one indicates that the device server supports the persist through power loss
capability see SPC-5 for persistent reservations and the APTPL bit in the PERSISTENT RESERVE OUT command parameter data.
0 An PTPL_C bit set to zero indicates that the device server does not support the persist through power loss capability.
TMV (Type Mask Valid) bit
1 A Type Mask Valid (TMV) bit set to one indicates that the PERSISTENT RESERVATION TYPE MASK field contains a bit map indicating which
persistent reservation types are supported by the device server.
0 A TMV bit set to zero indicates that the PERSISTENT RESERVATION TYPE MASK field shall be ignored.
The ALLOW COMMANDS (see table 84) indicates whether certain commands are allowed through certain types of persistent reservations.
PTPL_A (Persist Through Power Loss Activated) bit
1 A Persist Through Power Loss Activated (PTPL_A) bit set to one indicates that the persist through power loss capability is activated (see
SPC-5).
0 A PTPL_A bit set to zero indicates that the persist through power loss capability is not activated.
Table 84 ALLOW COMMANDS field
Code Description
000b
No information is provided about whether certain commands are allowed through certain types of persistent
reservations.
001b
The device server allows the TEST UNIT READY command (see 3.53) through Write Exclusive and Exclusive
Access persistent reservations and does not provide information about whether the following commands are
allowed through Write Exclusive persistent reservations:
a) the MODE SENSE, READ ATTRIBUTE, READ BUFFER, RECEIVE DIAGNOSTIC RESULTS, REPORT SUPPORTED
OPERATION CODES, and REPORT SUPPORTED TASK MANAGEMENT FUNCTION commands (see 3.35);
and
b) the READ DEFECT DATA command (see 3.25).
010b
The device server allows the TEST UNIT READY command through Write Exclusive and Exclusive Access
persistent reservations and does not allow the following commands through Write Exclusive persistent
reservations:
a) the MODE SENSE, READ ATTRIBUTE, READ BUFFER, RECEIVE DIAGNOSTIC RESULTS, REPORT SUPPORTED
OPERATION CODES, and REPORT SUPPORTED TASK MANAGEMENT FUNCTION commands; and
b) the READ DEFECT DATA command.
The device server does not allow the RECEIVE COPY RESULTS command through Write Exclusive or Exclusive
Access persistent reservations.
011b
The device server allows the TEST UNIT READY command through Write Exclusive and Exclusive Access
persistent reservations and allows the following commands through Write Exclusive persistent reservations:
a) the MODE SENSE, READ ATTRIBUTE, READ BUFFER, RECEIVE DIAGNOSTIC RESULTS, REPORT SUPPORTED
OPERATION CODES, and REPORT SUPPORTED TASK MANAGEMENT FUNCTION commands; and
b) the READ DEFECT DATA command.
The device server does not allow the RECEIVE COPY RESULTS command through Write Exclusive or Exclusive
Access persistent reservations.
100b
The device server allows the TEST UNIT READY command and the RECEIVE COPY RESULTS command through
Write Exclusive and Exclusive Access persistent reservations and allows the following commands through Write
Exclusive persistent reservations:
a) the MODE SENSE command, READ ATTRIBUTE command, READ BUFFER command, RECEIVE
DIAGNOSTIC RESULTS command, REPORT SUPPORTED OPERATION CODES command, and
REPORT SUPPORTED TASK MANAGEMENT FUNCTION command; and
b) the READ DEFECT DATA command.
101b to 111b
Reserved