IBM Support

Linux EDAC reports memory errors - IBM BladeCenter and System x

Troubleshooting


Problem

When running Linux, Error Detection and Correction (EDAC) modules report memory errors in the kernel log, but no memory failures areWhen running Linux, Error Detection and Correction (EDAC) modules report memory errors in the kernel log, but no memory failures are reported in the Advanced Management Module (AMM)/Management Module (MM) event log, the Remote Supervisor Adapter (RSA) log, the Baseboard Management Controller (BMC) log, or the Integrated Management Module (IMM) log. reported in the AdvancedManagement Module (AMM)/Management Module (MM) event log, the Remote Supervisor Adapter (RSA) log, the Baseboard Management Controller (BMC) log, or the Integrated Management Module (IMM) log.

Resolving The Problem

Source

RETAIN tip: H192890

Symptom

When running Linux, Error Detection and Correction (EDAC) modules report memory errors in the kernel log, but no memory failures are reported in the Advanced Management Module (AMM)/Management Module (MM) event log, the Remote Supervisor Adapter (RSA) log, the Baseboard Management Controller (BMC) log, or the Integrated Management Module (IMM) log.

Affected configurations

The system is configured with at least one of the following:

  • Red Hat Enterprise Linux 4, any update
  • Red Hat Enterprise Linux 5, any Update
  • Red Hat Enterprise Linux 6, any update
  • SUSE Linux Enterprise Server 11, any service pack

This tip is not system specific.

This tip is not option specific.

The system has the symptom described above.

Note: This does not imply that the network operating system will work under all combinations of hardware and software.

Please see the compatibility page for more information: http://www.ibm.com/systems/info/x86servers/serverproven/compat/us/

Solution

IBM does not use Linux EDAC functionality to provide reporting of Dual In-Line Memory Module (DIMM) errors.

Workaround

  1. Update the Basic Input/Output System (BIOS), Unified Extensible Firmware Interface (UEFI), or BMC firmware to the latest available version.
  2. If your system supports Chipkill, verify Chipkill memory functionality is enabled by pressing F1 for the BIOS Setup and then select Advanced Memory Settings.
  3. Disable any EDAC modules.

For example, below are the steps to disable EDAC using Red Hat Enterprise Linux 4 (RHEL4), Update 5:

 

a. Create a file /etc/modprobe.d/edac with following contents:

install *_edac /bin/true
install edac_* /bin/true

b. Reboot the server.

Additional information

Hardware, including memory Dual In-Line Memory Modules (DIMMs), will not be replaced under warranty based on EDAC /var/log/message errors. After EDAC modules are disabled, system diagnostics, BMC, RSA, and/or AMM/MM events will be used to verify memory problems.

Kernel modules have been developed for Linux that provide for hardware EDAC functionality within the operating system. Red Hat Enterprise Linux (RHEL) and SUSE Linux Enterprise Server (SLES) include several EDAC related kernel modules. such as edac_k8, edac_core, and so on.

Some kernel modules, for example edac_k8 or i7core_edac, are chipset-dependent and some are used in common. Linux kernel loads the necessary EDAC modules automatically when the system boots. There are currently no thresholds within EDAC kernel modules and alerts are generated on every event, including correctable errors.

IBM's Chipkill (Trademark) Error Correction Circuits (ECC) advanced memory includes a more sophisticated algorithm for error checking and correcting functionality. EDAC modules poll and read status registers of certain hardware every second, causing additional system overhead. Unfortunately, EDAC modules also clear the registers after each read.

BladeCenter components include enterprise level Predictive Failure Analysis (PFA) capability within the hardware. When an EDAC module clears these registers, it prevents BIOS and Systems Management Processors from using built in algorithms to detect, manage, and properly report errors.

Below are example kernel log messages in /var/log/messages:

 

kernel: EDAC k8 MC0: general bus error: participating processor(local node response), time-out(no timeout) memory transaction type(generic read), mem or I/O(mem access), cache level(generic)

kernel: MC0: CE page 0x391c3, offset 0xee0, grain 8, syndrome 0xa3b8, row 0, channel 1, label "": k8_edac

kernel: MC0: CE - no information available: k8_edac Error Overflow set

Document Location

Worldwide


Operating System

BladeCenter:Red Hat Enterprise Linux 4

BladeCenter:Red Hat Enterprise Linux 5

System x:Red Hat Enterprise Linux 4

System x:Red Hat Enterprise Linux 4 x86-64

System x:Red Hat Enterprise Linux 5

System x:Red Hat Enterprise Linux 5 x86-64

BladeCenter:SUSE Linux Enterprise Server 11

System x:SUSE Linux Enterprise Server 11

System x:SUSE Linux Enterprise Server 11 x86-64

BladeCenter:Red Hat Enterprise Linux 6

System x:Red Hat Enterprise Linux 6

System x:Red Hat Enterprise Linux 6 x86-64


Applicable countries and regions

  • Worldwide
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Document Information

More support for:
BladeCenter->BladeCenter HS20

Operating system(s):
Caldera, SurePOS

Document number:
853252

Modified date:
18 April 2023

UID

ibm1MIGR-5074651