User Manual

SCSI Commands Reference Manual, Rev. J 308
www.seagate.com Parameters for direct access devices
5.2.2.2.2.3 Parameter control byte values for unbounded data counter parameters
The device server shall return LOG SENSE parameter control byte values and process LOG SELECT parameter control byte values
as shown in table 270 for any log parameter that is defined to be an unbounded data counter log parameter.
If a LOG SELECT command contains an unbounded data counter log parameter in which the parameter control byte values differ
from those shown in table 270, then the command shall be terminated with CHECK CONDITION status, with the sense key set to
ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD IN PARAMETER LIST.
Each unbounded data counter log parameter contains one or more saturating counters or wrapping counters. The description of
each counter field in the log parameter defines when the device server modifies the contents of the counter that is transferred in
that field.
Changes in an unbounded data counter (e.g., a counter reaching saturation or another maximum value) shall not affect the
handling of other log parameters in the log page. The processing of a command and the status returned by that command shall
not be altered because a counter in an unbounded data counter log parameter saturates or reaches its maximum value.
The device server shall not change the value in the DU bit in an unbounded data counter log parameter unless requested to do
so by a LOG SELECT command.
5.2.2.2.2.4 Parameter control byte values for ASCII format list log parameters
The device server shall return LOG SENSE parameter control byte values and process LOG SELECT parameter control byte values
as shown in table 271 for any log parameter that is defined to be an ASCII format (see SPC-5) list log parameter.
If a LOG SELECT command contains an ASCII format list log parameter in which the parameter control byte values differ from
those shown in table 271, then the command shall be terminated with CHECK CONDITION status, with the sense key set to
ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD IN PARAMETER LIST.
Table 270 Parameter control byte values for unbounded data counter parameters
Field
or bit
Value for
LOG SENSE
Value for
LOG SELECT
Description
DU 0 or 1 0 or 1
If the DU bit is set to zero, the device server shall update the log parameter value or values
to reflect all events that should be noted by that parameter. If the DU bit is set to one, the
device server shall not update the log parameter value or values except in response to a
LOG SELECT command that specifies a new value for the parameter.
TSD 0 or 1 0 or 1
If the TSD bit is set to zero, the device server shall save the log parameter to its medium at
vendor specific intervals. If the TSD bit is set to one, implicit saving of the log parameter is
disabled by an application client.
FORMAT
AND
LINKING
10b 10b
The log parameter is a data counter for which saturation of another log parameter does
not affect the incrementing of this log parameter (see table 268).
Table 271 Parameter control byte values for ASCII format list log parameters
Field
or bit
Value for
LOG SENSE
Value for
LOG SELECT
Description
DU 0 ignored
The DU bit is not defined for list parameters.
TSD 0 or 1 0 or 1
If the TSD bit is set to zero, the device server shall save the log parameter to its medium at
vendor specific intervals. If the TSD bit is set to one, implicit saving of the log parameter is
disabled by an application client.
FORMAT
AND
LINKING
01b 01b
The log parameter is an ASCII format list parameter (see table 268).