Dell PowerEdge M820 Owner's Manual

Also see for PowerEdge M820 Systems: Manual Command reference guide Owner's manual Information update Release notes

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Dell PowerEdge M820 Owner's Manual Manual pdf 55 page image

NOTE: Memory sparing does not offer protection against a multi-bit uncorrectable error.NOTE: Both Advanced ECC/Lockstep and Optimizer modes support Memory Sparing.Memory MirroringMemory Mirroring offers the strongest DIMM reliability mode compared to all other modes, providing improveduncorrectable multi-bit failure protection. In a mirrored configuration, the total available system memory is one half ofthe total installed physical memory. Half of the installed memory is used to mirror the active DIMMs. In the event of anuncorrectable error, the system will switch over to the mirrored copy. This ensures SDDC and multi-bit protection.Memory installation guidelines:• Memory modules must be identical in size, speed, and technology.• DIMMs installed in memory sockets with white release tabs must be identical and similar rule applies forsockets with black and green release tabs. This ensures that identical DIMMs are installed in matched pairs -for example, A1 with A2, A3 with A4, A5 with A6, and so on.Sample Memory ConfigurationsThe following tables show sample memory configurations that follow the appropriate memory guidelines stated in thissection.NOTE: 1R, 2R, and 4R in the following tables indicate single-, dual-, and quad-rank DIMMs.Table 3. Memory Configurations – Two ProcessorsSystem Capacity (inGB) DIMM Size (inGB) Number ofDIMMs Organization andSpeed DIMM Slot Population4 2 2 1R x8, 1333 MT/s1R x8, 1600 MT/sA1, B18 2 4 1R x8, 1333 MT/s1R x8, 1600 MT/sA1, A2, B1, B216 2 8 1R x8, 1333 MT/s1R x8, 1600 MT/sA1, A2, A3, A4, B1, B2, B3, B420 2 10 1R x8, 1333 MT/s1R x8, 1600 MT/sA1, A2, A3, A4, A5, B1, B2, B3,B4, B532 2 16 1R x8, 1333 MT/s1R x8, 1600 MT/sA1, A2, A3, A4, A5, A6, A7, A8,B1, B2, B3, B4, B5, B6, B7, B832 4 8 2R x8, 1333 MT/s2R x8, 1600 MT/sA1, A2, A3, A4, B1, B2, B3, B464 4 16 2R x8, 1333 MT/s A1, A2, A3, A4, A5, A6, A7, A8,B1, B2, B3, B4, B5, B6, B7, B864 8 8 2R x4, 1333 MT/s2R x4, 1600 MT/sA1, A2, A3, A4, B1, B2, B3, B496 4 24 2R x8, 1333 MT/s A1, A2, A3, A4, A5, A6, A7, A8,A9, A10, A11, A12, B1, B2, B3,B4, B5, B6, B7, B8, B9, B10,B11, B1255