HP Surestore 80fx Optical Drive and Library SCSI-2 Command Reference - Page 76

Table 2-33 Table 2-34 SCSI-2 Drive Command Set Mode Select Command (15H) Control Mode Page 0AH Control Mode Page 0AH Byte 7 6 5 4 3 2 1 0 Reserved (0) Page Code (0AH) 1 Page Length (06H) 2 Reserved (0) 3 Queue Algorithm Modifiera Reserved 4-7 Reserved (0) a.For 9.1 and 5.2 Gbyte Capacity drives only. 0 DQue Queue Algorithm Modifier The queue algorithm modifier field specifies restrictions on the algorithm used for reordering commands that are tagged with the Simple Queue Tag message. DQue A Disabled Queuing bit of 1 indicates that command queuing is disabled. A Disabled Queuing bit of 0 indicates command queuing is enabled. Queue Algorithm Modifier Value 0H 01H 2H - 0FH Definition Restricted reordering Unrestricted reordering allowed Reserved A value of zero (0) in this field specifies that the target will order the actual execution sequence of the commands with a SIMPLE QUEUE TAG such that data integrity is maintained for that initiator. A value of one (1) in this field specifies that the target may reorder the actual execution of the commands with a SIMPLE QUEUE TAG in any manner. Chapter 2 2-39 SCSI-2 Drive Commands