Chapter 4. IBM System x3690 X5 143Table 4-15 DIMM population order: Memory-mirroring mode with the mezzanine installedDIMM installation: MAX5Table 4-16 shows the installation guide for MAX5 memory mirroring.Table 4-16 MAX5 memory mirroring setup4.8.7 Memory sparingSparing provides a degree of redundancy in the memory subsystem, but not to the extent thatmirroring does. For more information regarding memory sparing, see “Memory sparing” onpage 29. This section contains guidelines for installing memory for use with sparing. The twosparing options are DIMM sparing and rank sparing: DIMM sparingTwo unused DIMMs are spared per memory card. These DIMMs must have the same rankand capacity as the largest DIMMs that we are sparing. The size of the two unused DIMMsfor sparing is subtracted from the usable capacity presented to the operating system.DIMM sparing is applied on all memory cards in the system. Rank sparingTwo ranks per memory card are configured as spares. The ranks have to be as large asthe rank relative to the highest capacity DIMM that we are sparing. The size of the twounused ranks for sparing is subtracted from the usable capacity presented to the operatingsystem. Rank sparing is applied on all memory cards in the system.Sets of DIMMs Number of installedprocessorsDIMM connectorpopulation sequenceon the system boardDIMM connectorpopulation sequenceon the memory traySet 1 2 1, 8, 9, 16 17, 24, 25, 32Set 2 2 3, 6, 11, 14 19, 22, 27, 30Set 3 2 2, 7, 10, 15 18, 23, 26, 31Set 4 2 4, 5, 12, 13 20, 21, 28, 29Number of DIMMs MAX5DIMM 1DIMM 2DIMM 3DIMM 4DIMM 5DIMM 6DIMM 7DIMM 8DIMM 9DIMM 10DIMM 11DIMM 12DIMM 13DIMM 14DIMM 15DIMM 16DIMM 17DIMM 18DIMM 19DIMM 20DIMM 21DIMM 22DIMM 23DIMM 24DIMM 25DIMM 26DIMM 27DIMM 28DIMM 29DIMM 30DIMM 31DIMM 324 x x x x8 x x x x x x x x12 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 x20 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 x28 x x x x x x x x x x x x x x x x x x x x x x x x x x x x32 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
