Chapter 5. IBM BladeCenter HX5 199This list shows the correct DIMMs in each power domain: Power domain A: 1 - 4 and 5 - 8 Power domain B: 13 - 16 and 17 - 20 Power domain C: 9 - 12 and 21 - 24For the best memory performance, install the DIMMs by spreading them among all sixmemory buffers and all three power domains. Table 5-16 shows the installation order.Table 5-16 DIMM installation for the MAX5 for IBM BladeCenter5.10.3 Memory balanceThe Xeon 7500 Series processor uses a non-uniform memory architecture (NUMA), asdescribed in 2.3.4, “Nonuniform memory architecture (NUMA)” on page 26. Because NUMAis used, it is important to ensure that all memory controllers in the system are utilized byconfiguring all processors with memory. It is optimal to populate all processors in an identicalNumber of DIMMs Power domain A Domain C (½) Power domain B Domain C (½)Buffer Buffer Buffer Buffer Buffer BufferDIMM 1DIMM 2DIMM 3DIMM 4DIMM 5DIMM 6DIMM 7DIMM 8DIMM 9DIMM 10DIMM 11DIMM 12DIMM 13DIMM 14DIMM 15DIMM 16DIMM 17DIMM 18DIMM 19DIMM 20DIMM 21DIMM 22DIMM 23DIMM 242 x x4 x x x x6 x x x x x x8 x x x x x x x x10 x x x x x x x x x x12 x x x x x x x x x x x x14 x x x x x x x x x x x x x x16 x x x x x x x x x x x x x x x x18 x x x x x x x x x x x x x x x x x x20 x x x x x x x x x x x x x x x x x x x x22 x x x x x x x x x x x x x x x x x x x x x x24 x x x x x x x x x x x x x x x x x x x x x x x xMAX5 and VMware ESX: When using a MAX5 with VMware ESX 4.1 or ESXi 4.1, a bootparameter is required to access the MAX5 memory expansion unit. The MAX5 memoryexpansion unit utilizes NUMA technology, which needs to be enabled within the operatingsystem. Without enabling NUMA technology, you might see the following message:“The system has found a problem on your machine and cannot continue.Interleaved Non-Uniform Memory Access (NUMA) nodes are not supported.”See the RETAIN® tip H197190 for more information and the necessary parameters:http://ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5084842
