DS212-12 架子：温度传感器 9 紧急状态；低温故障

• 观察到底盘温度过低关机警报，并触发自动关机序列，随后取消。

 EMS日志：
[env_mgr: monitor.shutdown.chassisUnderTemp:error]: Chassis temperature is too cold: System temperature is critically low. System will be shutdown in 2 minutes.  
[env_mgr: monitor.shutdown.cancel:notice]: Automatic shutdown sequence canceled.
[dsa_worker2: ses.status.temperatureInfo:info]: DS212-12 (S/N ****) shelf 0 on channel 0b temperature information for Temperature sensor 9: normal status.
[statd: monitor.shelf.fault.ok:notice]: Fault previously reported on disk storage shelf attached to channel 0b has been corrected.
[env_mgr: callhome.chassis.undertemp:EMERGENCY]: Call home for CHASSIS UNDER TEMPERATURE SHUTDOWN
[env_mgr: monitor.chassisPowerSupply.degraded:notice]: Chassis power supply 2 is degraded: PSU2 sensors in bad state

• 温度传感器 9 位于critical 状态由于undertemperature 失败。

EMS日志：
 [power_low_monitor: monitor.chassisPower.degraded:alert]: Chassis power is degraded: Power Supply Status Critical: PSU2.
 [power_low_monitor: callhome.chassis.power:error]: Call home for CHASSIS POWER DEGRADED: Power Supply Status Critical: PSU2.
[ dsa_worker2: ses.status.temperatureError:error]: DS212-12 (S/N ***) shelf 0 on channel 0b temperature error for Temperature sensor 9: critical status; undertemperature failure. Current temperature: 0 C (32 F).  This module is on the rear of the shelf on the lower right power supply.

• 在PLATFORM-SENSORS.XML日志显示，PSU2 被报告处于故障状态。

PLATFORM-SENSORS.XML
PSU2 Bad   discrete   　fault　  normal   TRUE            
PSU1 Bad   discrete   　normal   normal   FALSE            
PSU2   discrete   fault         normal   BAD            
PSU1   discrete   normal         normal   GOOD

• 在ENVIRONMENT日志中，传感器 9 报告undertemperature失败。

Channel: 0b
Shelf: 0
SES device path: local access: 0b.00.99
Module type: IOM12G; monitoring is active  
Shelf status: normal condition
SES Configuration, shelf 0:

Temperature Sensor installed element list: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15; with error: 9
Shelf temperatures by element:
[1] 20 C (68 F) (ambient)  Normal temperature range
[2] 33 C (91 F)  Normal temperature range
[3] 33 C (91 F)  Normal temperature range
[4] 38 C (100 F)  Normal temperature range
[5] 38 C (100 F)  Normal temperature range
[6] 35 C (95 F) Normal temperature range
[7] 57 C (134 F)  Normal temperature range
[8] 38 C (100 F)  Normal temperature range
[9] 0 C (32 F) Undertemperature failure!
[10] 47 C (116 F)  Normal temperature range