IBM System x3850 X6 17
If memory mirroring is used, DIMMs must be installed in pairs for Performance mode (minimum of one
pair per each processor) and quads for RAS mode. DIMMs in the pair/quad must be identical in type and
size.
If memory rank sparing is used, then a minimum of two single-rank or dual-rank DIMMs must be installed
per populated channel (the DIMMs do not need being identical). In rank sparing mode, one rank of a
DIMM in each populated channel is reserved as spare memory. The size of a rank varies depending on
the DIMMs that are installed.
IBM eXFlash memory-channel storage
IBM eXFlash memory-channel storage are storage offerings in the physical form of memory DIMMs.
These IBM eXFlash DIMMs are installed in memory DIMM sockets but appear to the operating system
and applications as block storage devices. This new and innovative technology brings storage electrically
closer to the processor subsystem, therefore improving performance considerably.
The following table shows the supported eXFlash DIMMs.
Table 6. Internal storage expansion options
Part
number
Feature
code
Name and description Maximum
supported
00FE000 A4GX IBM eXFlash 200GB DDR3 Storage DIMM 32
00FE005 A4GY IBM eXFlash 400GB DDR3 Storage DIMM 32
The following figure shows one eXFlash DIMM installed with RDIMMs in the Compute Book.
Figure 5. IBM eXFlash DIMM installed in the Compute Book
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