SCSI Description

 

 

 

 

 

 

 

Control Mode Page-Field Descriptions (Page 0Ah)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameters Savable. This bit is only used with the MODE SENSE command.

 

(KGNFPS￿8CNWG

&GHCWNV1

A returned value of 1 indicates that&GUETKRVKQPthe 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

 

GLTSD

0

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.

 

 

 

 

 

RLEC

0

Report Log Exception Condition. The drive does not report log exception

 

conditions.

 

 

 

 

 

 

 

 

 

 

 

0001bTable

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

 

Queue

with a SIMPLE0QVstatement￿UWRRQTVGF.￿D[￿VJG￿FTKXG￿

 

Algorithm

5-73

 

 

Modifier

 

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

 

QErr

0

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.

 

 

DQue

0

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.

 

 

 

 

 

 

 

EECA

0

AEN enabled.

 

 

 

 

 

 

 

RAC

0

Report A Check Condition bit.

 

 

 

 

 

 

RAERP

0

Ready AER Permission.0QV￿UWR+IPTGFRQTVGF￿￿D[D[￿￿VJVJ￿D[￿VJG￿FTKXG￿

 

 

 

 

 

UAAERP

0

Unit Attention AER Permission. 0QV￿UWRRQTVG

 

 

 

 

 

 

EAERP

0

Error AER Permission.

R

 

Ready AER

 

 

QTVGF￿D[￿VJG￿

 

Holdoff

0

Not supported by the drive.

 

Period

 

 

 

 

 

 

 

 

 

Busy Time-

FFFFh

Not supported by the drive.

 

 

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.

Maxtor Atlas 10K III

5-57

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Image 121
Maxtor 10K III Control Mode Page-Field Descriptions Page 0Ah, Ready AER Permission.0QVUWR+IPTGFRQTVGFDDVJVJDVJGFTKXG, Rac