Dell PowerEdge M420 Owner's Manual

Also see for PowerEdge M420: Manual Command reference guide Owner's manual Administrator's guide Information update

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Dell PowerEdge M420 Owner's Manual Manual pdf 46 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 to support Memory Mirroring:• Memory channel 1 (memory sockets A1 and B1) is disabled in this mode.• Memory channels 2 and 3 must be populated.• Only quad-rank DIMMs are supported.• DIMMs installed must be identical in size, speed, and technology.Sample Memory ConfigurationsThe following tables show sample memory configurations that follow the appropriate memory guidelines stated in thissection.NOTE: 16 GB quad-rank RDIMMs are not supported.NOTE: 1R, 2R, and 4R in the following tables indicate single-, dual-, and quad-rank DIMMs respectively.Table 1. Memory Configurations – Single ProcessorSystem Capacity(in GB) DIMM Size (inGB) Number ofDIMMs Organization andSpeed DIMM Slot Population2 2 1 1R x8, 1333 MT/s A14 2 2 1R x8, 1333 MT/s A1, A26 2 3 1R x8, 1333 MT/s A1, A2, A312 4 3 1R x4, 1333 MT/s2R x8, 1333 MT/s2R x8, 1600 MT/sA1, A2, A324 8 3 2R x4, 1333 MT/s2R x4, 1600 MT/sA1, A2, A348 16 3 2R x4, 1333 MT/s2R x4, 1600 MT/sA1, A2, A396 32 3 4R x4, 1333 MT/s A1, A2, A3Table 2. Memory Configurations – Two ProcessorSystem Capacity (inGB)DIMM Size (inGB)Number ofDIMMsOrganization andSpeedDIMM Slot Population4 2 2 1R x8, 1333 MT/s A1, B18 2 4 1R x8, 1333 MT/s A1, A2, B1, B246Downloaded from www.Manualslib.com manuals search engine