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CPU-complex errors resulting from a possible crash/hang of the system may be seen on an X2-4 (formerly X4470M2) server due to a bug that affects LSI cards with downrev firmware running Linux.
This may cause the system to create SEL entries like the following to be logged:
96 | 03/01/2013 | 02:08:50 | Processor | SM BIOS Uncorrectable CPU-complex Error | Asserted
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X2-4 systems have been seen to be affected by the issue described in <Document: 1490545.1> This can be caused by low level hardware commands executed from the OS (for example lspci, dmidecode) either executed manually by the user, from a script or by the OS during normal operations. The issue is caused by an LSI firmware bug in 12.12.0-0048
This may result in the ILOM FMA flagging a processor as failed and indicate that replacement is needed. If a CPU-complex Error like the one above is seen and the server's SAS controller firmware is at 12.12.0-0048 please update the controller firmware before replacing any components.
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The fix is to upgrade the SAS controller to LSI firmware 12.12.0-0079 or newer.
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Mixing 2-rank and 4-rank DIMMs on the same riser is not supported.
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There was a question if the dual rank DIMMs could be substituted for the quad rank DIMMs. This is not permitted and is documented in the X2-4 Product Notes
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The DIMM exception will also appear in the next iteration of the Sun Server X2-4 Service Manual. The FRU output in ILOM snapshot will identify DIMMs as 2-rank or 4-rank.
DDR3L-1066/PC3L-8500 4-Rank/2Gbit SDRAM = Quad Rank DIMM
DDR3L-1600/PC3L-12800 2-Rank/4Gbit SDRAM = Dual Rank DIMM
Example: 16gb DIMM pairs; If you have 2-rank, order 7059236, if you have 4-rank order 542-0434
How to determine which 16GB 4-rank or 2-rank DIMM to use in X2-8 (formerly X4800M2) CMODs, or X2-4 (formerly X4470M2) memory risers. [ID 1556452.1]
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