Quantum 10K II - Manual (Page 144)

SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–77
MODE SELECT (6) Command (15h) (continued)
Table 5–37 Control Mode Page — Field Descriptions
Field Value Default Description
PS 1 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.
GLTSD 0 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.
RLEC 0 Report Log Exception Condition. The drive does not report
log exception conditions. Not supported by the drive.
Queue Algorithm Modifier 0001b This field specifies restrictions on the algorithm used for re-
ordering commands 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 order
are explicitly handled by the initiator through the selection
of appropriate commands and queue tag messages.
QErr 0 Queue Error Management. This field controls the drive’s
processing of queued commands when a Contingent
Allegiance (CA) condition or Extended Contingent
Allegiance (ECA) is cleared. Processing of queued
commands is resumed when a CA/ECA condition is
cleared.
(continued)