Sun Storage 9990 System
 
Sun Storage 9985 System
 

GCS>Sun Microsystems>Storage - Disk>Datacenter Disk
 

This document attempt to provide simple logically way to identify and judge whether over temperature SIM (System Information Message) received is genune
or false alarm cause by related hardware components failing.  It is inspire
by an escalation from field which query why no 45C (BF12xx or BF13xx) over temperature was reported before but 60C (BF10xx or BF11xx).  Logically the
45C warning should come first before the 60C.
Hence, it brought to the mind how do we tell if the SIMs (system messages)
generated for over temperature is genuine or brought about by faulty components
like THF (Thermo sensor) or the DKCMN (Disk Controller Monitor board)

For over temperature protection, the Sun StorEdge[TM] 99x0 is monitor by 2 kind of thermal Sensor (THF).  Two sensors each to detect 45C and 60C over temperature.  These are strategically located with 2 in the front and 2 in the back of the cabinet for Cluster 1 and cluster 2 of the DKC.  For details on THF please reference the location and replacement maintenance manual (MM).  The precise component that resulted in this category of SIM can be identified by
SIM = BF1010 = 60C overtemp detected by sensor in the front Logic 1 (CL1)
SIM = BF1011 = 60C overtemp detected by sensor in the front Logic 2 (CL2)
SIM = BF1110 = 60C overtemp detected by sensor in the rear Logic 1 (CL1)
SIM = BF1111 = 60C overtemp detected by sensor in the rear Logic 2 (CL2)
SIM = BF1210 = 45C overtemp detected by sensor in the front Logic 1 (CL1)
SIM = BF1211 = 45C overtemp detected by sensor in the front Logic 2 (CL2)
SIM = BF1310 = 45C overtemp detected by sensor in the rear Logic 1 (CL1)
SIM = BF1311 = 45C overtemp detected by sensor in the rear Logic 2 (CL2)
( SIMs are documented in the Maintenance Manual RC section )
Therefore, if there is a genuine over temperature building up in the DKC
cabinet, logically one would expect the progressive series of SIMs from 45C
(BF12xx and or BF13xx) showing up before the 60C (BF10xx and or BF11xx).
We should also seem if not all the category of over temperature SIMs listed
above appearing in the logs.
However, if only one particular SIMs reference code (eg: BF1011) show up,
then it could be ascertain that likely a hardware component failure rather
then over temperature.  Possibly the temperature sensor is at fault and it
could also be the DKCMN that it is connected to be the one.
Note: Only when 45C and 60C sensors detect overtemp in both CL1 and CL2, the subsystem will power off.  The same conditions of subsystem power off due to
over temperature apply to 9900,9900V, USP and NSC.

This solution has no attachment