Ibm Exflash Memory-Channel Storage - IBM x3850 X6 Planning And Implementation Manual

Figure 3-16 shows the DIMM slot numbering on each side of the Compute Book.
Microprocessor
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.
Left side of the Compute Book
DIMM 1 DIMM 2
DIMM 4 DIMM 5
Right side of the Compute Book
(Left side of board)
DIMM 13 DIMM 14 DIMM 15
DIMM 16 DIMM 17 DIMM 18
DIMM 3 DIMM 7 DIMM 8
DIMM 6 DIMM 10 DIMM 11 DIMM 12
DIMM 21 DIMM 20 DIMM 19
DIMM 22 DIMM 23 DIMM 24
Chapter 3. Product information
DIMM 9
73