User Manual

SCSI Commands Reference Manual, Rev. J 321
www.seagate.com Parameters for direct access devices
5.2.7.2 Temperature Limits log parameter
The Temperature Limits log parameter has the format shown in table 291.
PARAMETER CODE field
The PARAMETER CODE field is described in 5.2.2.2.1 and shall be as shown in table 289 for the Temperature Limits log parameters.
PARAMETER LENGTH field
The PARAMETER LENGTH field is described in 5.2.2.2.1 and shall be set as shown in table 291 for the Temperature Limits log parameters.
The temperature values reported in the Temperature Limits log parameters indicate a temperature in degrees Celsius. Negative values shall be
indicated by two's complement notation. A value of -128 (i.e., 80h) specifies that there is no limit.
HIGH CRITICAL TEMPERATURE LIMIT TRIGGER field
The HIGH CRITICAL TEMPERATURE LIMIT TRIGGER field indicates the maximum temperature at this sensor for which the logical unit should be
operated. If the EWASC bit is set to one in the Information Exceptions Control mode page (see SBC-4, SSC-4, or SMC-3) and the associated cur-
rent temperature (see 5.2.8.2) is greater than the value in the HIGH CRITICAL TEMPERATURE LIMIT TRIGGER field, then the device server shall
report an informational exception condition with the additional sense code set to WARNING - HIGH CRITICAL TEMPERATURE LIMIT EXCEEDED.
HIGH CRITICAL TEMPERATURE LIMIT RESET field
The HIGH CRITICAL TEMPERATURE LIMIT RESET field indicates the temperature at which the informational exception condition for a high criti-
cal temperature limit, if any, shall be cleared.
LOW CRITICAL TEMPERATURE LIMIT RESET field
The LOW CRITICAL TEMPERATURE LIMIT RESET field indicates the temperature at which the informational exception condition for a low critical
temperature limit, if any, shall be cleared.
LOW CRITICAL TEMPERATURE LIMIT TRIGGER field
The LOW CRITICAL TEMPERATURE LIMIT TRIGGER field indicates the minimum temperature at this sensor for which the logical unit should be
operated. If the EWASC bit is set to one in the Information Exceptions Control mode page (see SBC-4, SSC-4, or SMC-3) and the associated cur
-
rent temperature (see 5.2.8.2) is less than the value in the LOW CRITICAL TEMPERATURE LIMIT TRIGGER field, then the device server shall report
an informational exception condition with the additional sense code set to WARNING - LOW CRITICAL TEMPERATURE LIMIT EXCEEDED.
HIGH OPERATING TEMPERATURE LIMIT TRIGGER field
The HIGH OPERATING TEMPERATURE LIMIT TRIGGER field indicates the maximum temperature at this sensor for which the logical unit is capa-
ble of operating continuously without degrading the reliability beyond manufacturer accepted limits. If the EWASC bit is set to one in the Infor-
mation Exceptions Control mode page (see SBC-4, SSC-4, or SMC-3) and the associated current temperature (see 5.2.8.2) is greater than the
Table 291 Temperature Limits log parameter
Bit
Byte
7 6 5 4 3 2 1 0
0 (MSB)
PARAMETER CODE (see table 289)
1 (LSB)
2 PARAMETER CONTROL BYTE – binary format list log parameter (see 5.2.2.2.2.5)
3 PARAMETER LENGTH (08h)
4 HIGH CRITICAL TEMPERATURE LIMIT TRIGGER
5 HIGH CRITICAL TEMPERATURE LIMIT RESET
6 LOW CRITICAL TEMPERATURE LIMIT RESET
7 LOW CRITICAL TEMPERATURE LIMIT TRIGGER
8 HIGH OPERATING TEMPERATURE LIMIT TRIGGER
9 HIGH OPERATING TEMPERATURE LIMIT RESET
10 LOW OPERATING TEMPERATURE LIMIT RESET
11 LOW OPERATING TEMPERATURE LIMIT TRIGGER