Mode Page A (Control Mode - IBM Ultrastar 36LZX Specifications

8.8.9 Mode Page A (Control Mode Page Parameters)
Byte
7 6
0 PS RSVD=0
1
2
3 Queue Algorithm Modifier
4 EECA=0
5
(MSB) Ready AEN Holdoff Period
6-7
(MSB) Busy Timeout Period
8-9
(MSB) Extended Self-test Routine
10-11
Completion Time
Figure 89. Page A (Control Mode Page Parameters)
Following are parameter options for Page 0A of MODE SELECT.
Ÿ Queue algorithm modifier specifies restrictions on the algorithm used for reordering commands
that are tagged with the SIMPLE QUEUE TAG message.
0h : Restricted reordering. The target shall reorder the actual execution sequence of the queued
commands from each initiator such that data integrity is maintained for that initiator.
1h : Unrestricted reordering allowed. The target may reorder the actual execution sequence of the
queued commands in any manner it selects. Any data integrity exposures related to command
sequence order are explicitly handled by the initiator through the selection of appropriate commands
and queue tag messages.
2h-7h : RESERVED.
8 : Command reordering is disabled
9-Fh : RESERVED
Ÿ QErr (Queue Error Management) bit of zero specifies that the Target suspends execution of queued
and active commands from any Initiator which receives a Check Condition Status until pending
sense data is cleared. Those commands still queued after the Target has returned Check Condition
Status, continue execution in a normal manner when the pending status is cleared. A QErr bit of one
specifies that all active commands and all queued commands from all initiators are aborted when the
Target returns the Check Condition Status. A unit attention condition will be generated for each
initiator which had commands in the queue except for the initiator that received the Check Condition
Status. The sense key will be set to Unit Attention and the additional sense code will be set to
COMMANDS CLEARED BY ANOTHER INITIATOR.
Bit
5 4 3
Page Code = 0Ah
Page Length = 0Ah
Reserved = 0
Reserved = 0
Reserved = 0
Reserved = 0
Ultrastar 36LZX hard disk drive specifications
2 1
QErr
RAENP UAAENP
= 0 = 0
115
Default
0
8Ah
0Ah
RLEC=0 00h
DQue 00h
EAENP
00h
= 0
00h
00h
(LSB)
00h
(LSB)
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(LSB)