IBM 88554RU Installation Guide - Page 72
Memory mirroring, Port 1 DIMM slots
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Pair Port 1 DIMM slots 7 4 and 11 9 5 and 10 11 6 and 9 13 7 and 8 Pair Port 2 DIMM slots 8 18 and 25 10 19 and 24 12 20 and 23 14 21 and 22 Figure 3-2 shows the DIMM locations and the way the DIMMs are divided into the two memory ports. Port 1 Port 2 Front of server Figure 3-2 DIMM locations on the memory-board assembly Memory mirroring Memory mirroring is supported by the x455 for increased fault tolerance and high levels of availability. Key configuration rules relating to memory mirroring are: Memory mirroring must be enabled in the System Setup in the EFI (it is disabled by default). See "Enabling memory mirroring" on page 118. Enabling memory mirroring halves the amount of memory available to the operating system. 58 IBM xSeries 455 Planning and Installation Guide Eserver