Error: "Enclosure PD 0c(c 01/p0) temperature sensor X differential detected"

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Issue/Introduction

This message may appear on RAID adapter 1 or 2, from the Dell H810 RAID controllers which attach to external disk enclosures. Here is an example of the full message from /var/log/messages:

Mar  9 08:25:01 ds3132 disk_subsystem[11774]: snlog: sn="##:##:##:##:##:##" id="DS" m="23" c="6" event="DISK_STATUS" category="HARDWARE" ip="10.0.0.1" model="R720xd" msg="Adapter 1; seqNum: 0x0002b22c; Time: Wed Mar  9 08:21:08 2016; Event Description: Enclosure PD 0c(c 01/p0) temperature sensor 3 differential detected; Device ID: 12; Enclosure Index: 0; Slot Number: 0; "


 

Resolution

This message means that two temperature sensors in one of the external enclosures have different readings. According to Dell, this is frequently an invalid error because the threshold for the difference is quite small - just a few degrees. However, it should be manually verified at the disk enclosure. To do so,

1. Make sure that airflow to the rack is adequate across the entire front of the enclosure
2. Make sure both power supply fans in the back of the disk enclosure are running and have good airflow
3. Check the temperature of the exhaust of both power supplies, they should be similar (this can be done with a thermometer or simply by feeling the exhaust with one's hands).

If all of these three checks are okay, this message can be safely ignored.

"Battery charging was suspended due to high battery temperature"

This message may appear any of the RAID adapters, however it most frequently appears on adapter 0, the Dell H710 Mini RAID controller which is attached to the internal drives of the head unit (Dell R620 or R720xd). Here is an example of the full message from /var/log/messages:

Mar  9 08:15:01 ds3132 disk_subsystem[2693]: snlog: sn="##:##:##:##:##:##" id="DS" m="23" c="6" event="DISK_STATUS" category="HARDWARE" ip="10.0.0.1" model="R720xd" msg="Adapter 0; seqNum: 0x0002a75a; Time: Wed Mar  9 08:12:03 2016; Event Description: Battery charging was suspended due to high battery temperature; "

For Adapters 1 and 2, the battery will need to be addressed. Please call Blue Coat Support for assistance.

For Adapter 0, this message is normally invalid due to a bug in the adapter firmware. (See the Dell KB on this issue here.)
The correct status of the battery may be determined using the following command, logged in via SSH as 'root':
megacli -adpbbucmd -getbbustatus -a0 | egrep "Temp|Charg"

For example:
[root@hostname ~]# megacli -adpbbucmd -getbbustatus -a0 | egrep "Temp|Charg"
Temperature: 38 C
  Charging Status              : None
  Temperature                  : OK
  Fully Charged           : Yes
  Over Temperature        : No
  Over Charged            : No
Relative State of Charge: 98 %
Charger Status: Complete
Full Charge Capacity: 519 mAh

If the battery is charged and the temperature is OK, then the original message is invalid as stated in Dell's KB article.  Please contact Blue Coat Support for assistance with updating the firmware of that controller.