IBM 88743RU - System x3950 E User Manual

Also see for System x3950: Configuration and options guide Specifications Problem determination and service guide Installation guide

Contents

Table 4. Alternate memory card installation sequence (continued)Memory card order Memory card DIMM pairFourth 4 1 and 32 and 4Table 5. Memory card installation sequence for memory-mirrored configurationMemory card order Memory card DIMM pairFirst 1 1 and 33 1 and 3Second 2 1 and 34 1 and 3Third 1 2 and 43 2 and 4Fourth 2 2 and 44 2 and 4v There are two memory power buses split between the four memory cards.Memory cards 1 and 2 are on power bus 1, and memory cards 3 and 4 are onpower bus 2. If memory mirroring is enabled, you can hot-replace one memorycard at a time on each memory power bus.v If a problem with a DIMM is detected, light path diagnostics will light thesystem-error LED on the front of the server, indicating that there is a problemand guide you to the defective DIMM. When this occurs, first identify thedefective DIMM; then, remove and replace the DIMM.The following illustration shows the LEDs on the memory card:Memory Hot-Swap EnabledMemory Port PowerErrorMemory Hot-Swap Enabled LED: When this LED is lit, it indicates thathot-swap memory is enabled.Error LED: When this LED is lit, it indicates that a memory card or DIMM hasfailed.Memory Port Power LED: When this LED is off, it indicates that power isremoved from the port and that you can remove the memory card and replace afailed DIMM. This LED will also turn off when the release levers are opened.Note: Add odd numbered DIMMs to each available memory card first, then addthe even numbered pairs.Active MemoryActive Memory is an IBM technology that improves the reliability of the DIMMsthrough the memory mirroring, memory scrubbing, and Memory ProteXion ™features.Chapter 2. Installing options 33