Control Mode Page-Field Descriptions (Page 0Ah); Tagged Command Queuing - Maxtor ATLAS 10K III Product Manual

T a b l e 5 - 7 3 Control Mode Page-Field Descriptions (Page 0Ah)
( K G N F 8 C N W G & G H C W N V
PS 1
GLTSD 0
RLEC 0
Queue
Algorithm 0001b
Modifier
QErr 0
DQue 0
EECA 0
RAC 0
RAERP 0
UAAERP 0
EAERP 0
Ready AER
Holdoff 0
Period
Busy Time-
FFFFh
out Period
NOTES:
If the Queue Algorithm Modifier specifies restricted re-ordering (0000b), commands
are not allowed to execute concurrently. If this field specifies unrestricted re-ordering
(0001b), concurrent I/O execution is allowed.
Parameters Savable. This bit is only used with the MODE SENSE command.
A returned value of 1 indicates that the target is capable of saving the page
in a non-volatile, vendor-specific location. The bit is reserved with the
MODE SELECT command.
Global Logging Target Save Disable. If this bit = 1, the ability to save log
ages to disk is disabled. If a LOG SELECT with the SP bit is received by the
drive, the current cumulative values will be cleared. The on-disk values will
not be changed. If a LOG SENSE with the SP bit set is received by the drive
and the GLTSD bit is set and the unit is ready, the last LOG counter values
written to disk will be returned (not the current cumulative values).
If a STOP UNIT command or a LOG SENSE command with the SP bit set is
issued to the drive, the cumulative values of the Log Counters page will be
written to disk. A LOG SENSE command will return the cumulative values
since the counters were cleared, not since the drive was powered on.
Report Log Exception Condition. The drive does not report log exception
conditions.
0 Q V U W R R Q T V G F D [ V J G F T K X G 
This field specifies restrictions on the algorithm used for re-ordering com-
mands that are tagged with the SIMPLE message.
A value of 0 specifies that the drive orders the actual execution sequence
with a SIMPLE statement.
A value of 1 (Unrestricted Re-ordering Allowed) specifies that the drive can
re-order the actual execution sequence of the commands with a SIMPLE in
any manner. Any data integrity exposures related to command sequence or-
der are explicitly handled by the initiator through the selection of appropriate
commands and queue tag messages.
Queue Error Management. This field controls the drive's processing of
queued commands when a Contingent Allegiance (CA) condition or Extend-
ed Contingent Allegiance (ECA) is cleared. Processing of queued commands
is resumed when a CA/ECA condition is cleared.
Disable Queue. When set to the default value of 0, the drive supports

tagged command queuing.

When the Disable Queue bit is set to 1, tagged command queuing is dis-
abled. A subsequent tagged message from the initiator is rejected with a
MESSAGE REJECT message and the I/O process is executed as an un-
tagged command.
AEN enabled.
Report A Check Condition bit.
Ready AER Permission.
0 Q V U W R R Q T V G F D [ V J G F T K X G 
Unit Attention AER Permission.
Error AER Permission.
0 Q V U W R R Q T V G F D [ V J G F T K X G 
Not supported by the drive.
Not supported by the drive.
& G U E T K R V K Q P
+ I P Q T G F D [ V J G F T K X G 
0 Q V U W R R Q T V G F D [ V J G F T K X G 
Maxtor Atlas 10K III
SCSI Description
5-57