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memory mirroring does. If a predetermined threshold of correctable errors is reached, the contents of the
failing DIMM are copied to the spare memory, and the failing DIMM or rank is disabled. To enable memory
sparing through the Setup utility, select System Settings ➙ Memory.
• See "Installing a DIMM - IBM MAX5" on page 108 for more information about memory requirements for
the IBM MAX5 expansion blade.
If one processor is installed, memory sparing is set up as follows:
Table 10. Memory sparing with one processor
DIMM Pair
DIMM 2, DIMM 3
DIMM 6, DIMM 7
If two processors are installed, memory sparing is set up as follows:
To install a DIMM, complete the following steps:
Table 11. Memory sparing with two processors
DIMM Pair
DIMM 2, DIMM 3
DIMM 6, DIMM 7
DIMM 10, DIMM 11
DIMM 14, DIMM 15
Note: If all DIMMs are of the same size, the memory reference code (MRC) sets sparing in the farthest DIMM
pair. Otherwise, the largest DIMM pair is set aside as spare.
DIMM installation procedure
To install a DIMM, complete the following steps:
Step 1.
Before you begin, read "Safety" on page v and "Installation guidelines" on page 65.
Step 2.
Read the documentation that comes with the DIMMs.
Step 3.
If the blade server or scalable blade complex is installed in a BladeCenter chassis, remove it. See
"Removing the blade server from the BladeCenter chassis" on page 66 for instructions.
Step 4.
Carefully lay the blade server on a flat, static-protective surface.
Step 5.
If you are installing the DIMM into a blade server that is the bottom blade server in a scalable blade
complex, disassemble the blade complex (see "Disassembling a scalable blade complex" on page
68 for instructions).
Step 6.
If an IBM MAX5 expansion blade is installed, remove it (see "Removing an IBM MAX5 expansion
blade" on page 87 for instructions).
Step 7.
Open the blade server cover (see "Removing the blade server cover" on page 71 for instructions).
Step 8.
Locate the DIMM connectors (see "Blade server connectors - BladeCenter HX5" on page 12).
Determine the DIMM connector into which you will be installing memory.
Step 9.
If another memory module is already installed in the DIMM connector, remove it (see "Removing a
DIMM - BladeCenter HX5" on page 103).
106
BladeCenter HX5 Blade ServerProblem Determination and Service Guide
Spare Pair
DIMM 1, DIMM 4
DIMM 5, DIMM 8
Spare Pair
DIMM 1, DIMM 4
DIMM 5, DIMM 8
DIMM 9, DIMM 12
DIMM 13, DIMM 16
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