Chapter 3. Product information 73
Figure 3-16 shows the DIMM slot numbering on each side of the Compute Book.
Figure 3-16 DIMM slot numbering
For Rank Sparing, the spare rank must have identical or larger memory capacity than all the
other ranks (sparing source ranks) on the same channel. A minimum of 2 DIMMs per channel
is required if using ONLY single rank DIMMs. The DIMM installation order would need to be
modified accordingly to accommodate single rank only configurations. Rank Sparing can be
supported with 1 DIMM per channel if using multi-rank DIMMs. Configurations consisting of
multiple CPU sockets must have matching memory configurations on all CPUs because
memory sparing is globally applied across all CPU sockets when enabled.
If you use IBM eXFlash DIMMs, see additional information about population order of eXFlash
DIMMs in 3.9, “IBM eXFlash memory-channel storage” on page 73.
3.9 IBM eXFlash memory-channel storage
As described in 2.6.2, “IBM eXFlash memory-channel storage” on page 38, IBM eXFlash
memory-channel storage is a new innovative ultrafast flash storage offering in the physical
form of memory DIMMs. IBM eXFlash DIMMs are installed in memory DIMM sockets but
appear to the operating system and applications as block storage devices.
DIMM 1 DIMM 2 DIMM 3
DIMM 4 DIMM 5 DIMM 6 DIMM 10 DIMM 11 DIMM 12
DIMM 7 DIMM 8 DIMM 9Microprocessor
(Left side of board)
Rear
Rear
Front
Front
Left side of the Compute Book
Right side of the Compute Book
DIMM 24
DIMM 23
DIMM 22
DIMM 19DIMM 20
DIMM 21
DIMM 15
DIMM 14
DIMM 13
DIMM 18
DIMM 17
DIMM 16
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