IBM System x3850 X5 Implementation Guide

Chapter 4. IBM System x3690 X5 143
Table 4-15 DIMM population order: Memory-mirroring mode with the mezzanine installed
DIMM installation: MAX5
Table 4-16 shows the installation guide for MAX5 memory mirroring.
Table 4-16 MAX5 memory mirroring setup
4.8.7 Memory sparing
Sparing provides a degree of redundancy in the memory subsystem, but not to the extent that
mirroring does. For more information regarding memory sparing, see “Memory sparing” on
page 29. This section contains guidelines for installing memory for use with sparing. The two
sparing options are DIMM sparing and rank sparing:
򐂰 DIMM sparing
Two unused DIMMs are spared per memory card. These DIMMs must have the same rank
and capacity as the largest DIMMs that we are sparing. The size of the two unused DIMMs
for sparing is subtracted from the usable capacity presented to the operating system.
DIMM sparing is applied on all memory cards in the system.
򐂰 Rank sparing
Two ranks per memory card are configured as spares. The ranks have to be as large as
the rank relative to the highest capacity DIMM that we are sparing. The size of the two
unused ranks for sparing is subtracted from the usable capacity presented to the operating
system. Rank sparing is applied on all memory cards in the system.
Sets of DIMMs Number of installed
processors
DIMM connector
population sequence
on the system board
DIMM connector
population sequence
on the memory tray
Set 1 2 1, 8, 9, 16 17, 24, 25, 32
Set 2 2 3, 6, 11, 14 19, 22, 27, 30
Set 3 2 2, 7, 10, 15 18, 23, 26, 31
Set 4 2 4, 5, 12, 13 20, 21, 28, 29
Number of DIMMs
MAX5
DIMM 1 DIMM 2 DIMM 3 DIMM 4 DIMM 5 DIMM 6 DIMM 7 DIMM 8 DIMM 9 DIMM 10 DIMM 11 DIMM 12 DIMM 13 DIMM 14 DIMM 15 DIMM 16 DIMM 17 DIMM 18 DIMM 19 DIMM 20 DIMM 21 DIMM 22 DIMM 23 DIMM 24 DIMM 25 DIMM 26 DIMM 27 DIMM 28 DIMM 29 DIMM 30 DIMM 31 DIMM 32
4 x x x x
8
x x x x x x x x
12
x x x x x x x x x x x x
16
x x x x x x x x x x x x x x x x
20
x x x x x x x x x x x x x x x x x x x x
24
x x x x x x x x x x x x x x x x x x x x x x x x
28
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
32
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

IBM System x3850 X5 Specifications

General

Brand	IBM
Model	System x3850 X5
Category	Server
Language	English