T7-x: BoB DCAL command timeout errors reported against memory dimms.

Asset ID:	1-72-2357844.1
Update Date:	2018-02-06
Keywords:

Solution Type Problem Resolution Sure

Solution 2357844.1 : T7-x: BoB DCAL command timeout errors reported against memory dimms.

Applies to:

SPARC T7-1 - Version All Versions to All Versions [Release All Releases]
SPARC T7-2 - Version All Versions to All Versions [Release All Releases]
SPARC T7-4 - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

Dimm flagged during POST reporting "BoB DCAL command timeout"

2017-07-07 11:33:01 SP> NOTICE: Host is off
2017-07-07 11:58:48 SP> NOTICE: Start Host in progress: Step 2 of 7
2017-07-07 11:58:48 SP> NOTICE: Start Host in progress: Step 3 of 7
2017-07-07 11:58:51 SP> NOTICE: Start Host in progress: Step 4 of 7
@(#)Hostconfig 1.8.4 2016/12/08 06:15
2017-07-07 12:05:11 0:00:0> NOTICE: Firmware timezone is AST
2017-07-07 12:05:14 0:00:0> NOTICE: Using HW change diag level and verbosity
...
2017-07-07 12:19:18 0:00:0> ERROR: /SYS/MB/CM/CMP/BOB21/CH0/DIMM: BoB DCAL command timeout <-----------------
2017-07-07 12:19:18 0:00:0> NOTICE: Applying Memory Reconfiguration Policy
2017-07-07 12:19:18 0:00:0> ERROR: /SYS/MB/CM/CMP/MR0/BOB20/CH1/DIMM: DIMM population chip symmetry rule violation. Not configured
2017-07-07 12:19:18 0:00:0> ERROR: /SYS/MB/CM/CMP/BOB21/CH1/DIMM: DIMM population chip symmetry rule violation. Not configured
2017-07-07 12:19:18 0:00:0> WARNING: Running with a nonstandard DIMM configuration. Refer to service document for details.

FMA may also generate a fault against the dimm reporting the timeout

------------------- ------------------------------------ -------------- --------
Time UUID msgid Severity
------------------- ------------------------------------ -------------- --------
2017-07-07/12:13:33 37f8d21a-8ee0-4bed-981f-d82b77f881f8 SPSUN4V-8002-8A Major

Problem Status : open
Diag Engine : fdd 1.0
System
Manufacturer : Oracle Corporation
Name : SPARC T7-1
Part_Number : 34201652+1+1
Serial_Number : AK00358358

System Component
Firmware_Manufacturer : Oracle Corporation
Firmware_Version : (ILOM)3.2.8.1.a,(POST)5.5.4,(OBP)4.40.4,(HV)1.17.4
Firmware_Release : (ILOM)2016.12.08,(POST)2016.12.08,(OBP)2016.12.08,(HV)2016.12.08

----------------------------------------
Suspect 1 of 2
Problem class : fault.memory.dimm
Certainty : 100%
Affects : /SYS/MB/CM/CMP/BOB21/CH0/DIMM
Status : faulted

FRU
Status : faulty
Location : /SYS/MB/CM/CMP/BOB21/CH0/DIMM
Manufacturer : Samsung
Name : 32768MB DDR4 SDRAM DIMM
Part_Number : 07075400,M393A4K40BB1-CRC
Revision : 01
Serial_Number : 00CE03171719269E92
Chassis
Manufacturer : Oracle Corporation
Name : SPARC T7-1
Part_Number : 34201652+1+1
Serial_Number : AK00358358
----------------------------------------
Suspect 2 of 2
Problem class : fault.memory.multidimm
Certainty : 100%
Affects : /SYS/MB/CM/CMP/MR0/BOB20/CH0/DIMM
Status : faulted

FRU
Status : faulty
Location : /SYS/MB/CM/CMP/MR0/BOB20/CH0/DIMM
Manufacturer : Samsung
Name : 32768MB DDR4 SDRAM DIMM
Part_Number : 07075400,M393A4K40BB1-CRC
Revision : 01
Serial_Number : 00CE03171719269F42
Chassis
Manufacturer : Oracle Corporation
Name : SPARC T7-1
Part_Number : 34201652+1+1
Serial_Number : AK00358358

Description : Excessive correctable dimm errors have occurred.

Response : No system response required.

Impact : System performance may be affected.

Action : Use 'fmadm faulty' to provide a more detailed view of this
event. Please refer to the associated reference document at
http://support.oracle.com/msg/SPSUN4V-8002-8A for the latest
service procedures and policies regarding this diagnosis.

Changes

No changes were made to the sever. Patching or otherwise.

Cause

Data buffers are susceptible to slow power up times.

Solution

Issue is resolved in System Firmware 9.7.6.b and later which increases the threshold providing faster power up time for the data buffers.

References

<BUG:22726871> - APPLY WORKAROUND FOR MONTAGE DB SENSITIVITY TO SLOWER VDDQ/VTTQ RAMP UP TIME
<NOTE:2010314.1> - SPSUN4V-8002-8A - The number of correctable errors associated with several memory modules have exceeded acceptable levels.
<NOTE:1522733.1> - SPSUN4V-8000-CQ - Memory module correctable errors exceeding acceptable levels

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