Sun Fire X4800 Server Product Notes

DIMM Failure Causes Other DIMMs To Be Disabled (CR 6929978)

When a pair of DIMMs is disabled due to faults, BIOS disables other DIMMs to maintain a valid configuration. For example:

• In an 8-socket system, if a single DIMM is disabled due to faults, BIOS disables either 4 or 8 DIMMs depending on the socket number:

  Faulted DIMM Disabled DIMMs D0 or D4 D0, D4, D1, D5, D8, D9, D12, D13 D1 or D5 D1, D5, D9, D13 D2 or D6 D2, D6, D3, D7, D10, D11, D14, D15 D3 or D7 D3, D7, D11, D15 D8 or D12 D0, D4, D1, D5, D8, D9, D12, D13 D9 or D13 D1, D5, D9, D13 D10 or D14 D2, D6, D3, D7, D10, D11, D14, D15 D11 or D15 D3, D7, D11, D15

• In a 4–socket system, a faulted DIMM causes the BIOS to disable either two or four DIMMs, depending on the socket number.

  Faulted DIMM Disabled DIMMs D0 or D4 D0, D4, D1, D5 D1 or D5 D1, D5 D2 or D6 D2, D6, D3, D7 D3 or D7 D3, D7 D8 or D12 D8, D9, D12, D13 D9 or D13 D9, D13 D10 or D14 D10, D11, D14, D15 D11 or D15 D11, D15

Workaround

1. Identify the faulted DIMMs.

   Open the Oracle ILOM fault management tab.

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   Note -  DIMMs are always faulted in pairs, and should always be replaced in pairs.

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   • Faulty DIMMs are listed as:

     • fault.memory.intel.nex.dimm_ce, or

     • fault.memory.intel.nex.dimm_ue

   • In 4–socket systems, Oracle ILOM only lists the faulted DIMMs. In 8–socket systems, Oracle ILOM also lists disabled DIMMs. These are listed as fault.memory.intel.dimm.population.invalid.

   • If all the DIMM are listed as fault.memory.intel.dimm.population.invalid, then the configuration is invalid.

2. Replace the faulted DIMMs.

   Refer to Removing and Installing DIMMs (CRU) in Sun Fire X4800 Server Service Manual.

3. Clear the DIMM faults in Oracle ILOM.

   Refer to your Oracle ILOM documentation collection for details.