Dell DR4100 Owner's Manual

Also see for PowerVault DR4100: Administrator's guide Reference guide Release note Manual Manual

Contents

Memory Optimized (Independent Channel) ModeThis mode supports SDDC only for memory modules that use x4 device width and does not impose any specific slotpopulation requirements.Memory SparingNOTE: To use memory sparing, this feature must be enabled in the System Setup.In this mode, one rank per channel is reserved as a spare. If persistent correctable errors are detected on a rank, thedata from this rank is copied to the spare rank and the failed rank is disabled.With memory sparing enabled, the system memory available to the operating system is reduced by one rank perchannel. For example, in a dual-processor configuration with sixteen 4 GB dual-rank DIMMs, the available systemmemory is: 3/4 (ranks/channel) × 16 (DIMMs) × 4 GB = 48 GB, and not 16 (DIMMs) × 4 GB = 64 GB.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.Memory ConfigurationThe following table shows the supported memory configuration for a two processor configuration that follows theappropriate memory guidelines stated in this section.NOTE: 2R in the following table indicates a single-rank DIMM.Table 1. Memory ConfigurationSystemCapacity (inGB)DIMM Size (inGB) Number ofDIMMs DIMM Rank, Organization,and Frequency DIMM Slot Population32 8 4 2R, x8, 1333 MT/s A1, A2, B1, B2Removing Memory ModulesWARNING: The memory modules are hot to the touch for some time after the system has been powered down.Allow time for the memory modules to cool before handling them. Handle the memory modules by the card edgesand avoid touching the components on the memory module.CAUTION: Many repairs may only be done by a certified service technician. You should only performtroubleshooting and simple repairs as authorized in your product documentation, or as directed by the online ortelephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by yourwarranty. Read and follow the safety instructions that came with the product.37