IBM X3850 X6 Product Manual

Also see for X3850 X6: Installation and service guide Planning and implementation guide Installation instructions

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IBM System x3850 X6 17If memory mirroring is used, DIMMs must be installed in pairs for Performance mode (minimum of onepair per each processor) and quads for RAS mode. DIMMs in the pair/quad must be identical in type andsize.If memory rank sparing is used, then a minimum of two single-rank or dual-rank DIMMs must be installedper populated channel (the DIMMs do not need being identical). In rank sparing mode, one rank of aDIMM in each populated channel is reserved as spare memory. The size of a rank varies depending onthe DIMMs that are installed.IBM eXFlash memory-channel storageIBM eXFlash memory-channel storage are storage offerings in the physical form of memory DIMMs.These IBM eXFlash DIMMs are installed in memory DIMM sockets but appear to the operating systemand applications as block storage devices. This new and innovative technology brings storage electricallycloser to the processor subsystem, therefore improving performance considerably.The following table shows the supported eXFlash DIMMs.Table 6. Internal storage expansion optionsPartnumberFeaturecodeName and description Maximumsupported00FE000 A4GX IBM eXFlash 200GB DDR3 Storage DIMM 3200FE005 A4GY IBM eXFlash 400GB DDR3 Storage DIMM 32The following figure shows one eXFlash DIMM installed with RDIMMs in the Compute Book.Figure 5. IBM eXFlash DIMM installed in the Compute Book