Dimm Rank Classification Labels; Error Correction And Parity - Oracle Sun Netra X4270 Service Manual

Replacing DIMMs

DIMM Rank Classification Labels

DIMMs come in a variety of ranks: single, dual, or quad. Each DIMM is shipped with a
label identifying its rank classification. The following table identifies the corresponding rank
classification label shipped with each DIMM.
TABLE 7
Rank Classification
Quad-rank DIMM
Dual-rank DIMM
Single-rank DIMM
Related Information
"DIMM and CPU Physical Layout" on page 133
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"DIMM Considerations and Limitations" on page 135
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"Error Correction and Parity" on page 136
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"Identify and Remove Faulty DIMMs" on page 137
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"Install DIMMs" on page 141
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Error Correction and Parity

The server???s processor provides parity protection on its internal cache memories and ECC
protection of the data. The system can detect and log these types of errors to the ILOM event
log:
Correctable and uncorrectable memory ECC errors
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Uncorrectable CPU internal errors
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Advanced ECC corrects up to 4-bits in error on nibble boundaries, as long as al l of these bits
are all in the same DRAM. If a DRAM fails, the DIMM continues to function.
For instructions for clearing DIMM faults, see
information about fault management, refer to the ILOM 3.0 documentation.
Related Information
"DIMM and CPU Physical Layout" on page 133
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136 Sun Netra X4270 Server • September 2015
DIMM Classification Labels
Label
4Rx4
2Rx4
1Rx4
"Install DIMMs" on page 141. For more