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Table 8. System memory configuration for a two processors (2 microprocessors) (continued)
Installed memory
10 DIMMs
12 DIMMs
14 DIMMs
16 DIMMs
Important: If you are installing memory in a scalable blade complex, you should install the DIMMs to have a
balance of memory among processors. Additional memory can be installed in the top-most BladeCenter HX5
of the scalable blade complex blade server so that you do not need to disassemble the scalable blade
complex. For example, if you are installing four DIMMs in a scalable blade complex consisting of two
BladeCenter HX5 blade servers, you would install two DIMMs (in sockets 1 and 4) of each blade server.
The BladeCenter HX5 blade server supports memory mirroring. When enabled, the first DIMM quadrant is
duplicated onto the second DIMM quadrant for each processor.
Notes:
• To enable memory mirroring, the DIMMs installed for each processor must be identical.
• Memory mirroring reduces the available memory by half. For example, if the server has 64 GB of installed
memory, only 32 GB of addressable memory is available when memory mirroring is enabled.
If one processor is installed, memory mirroring is set up as follows:
Table 9. Memory mirroring with one processor
DIMM Quadrant
DIMM 1, DIMM 2, DIMM 3, DIMM 4
If two processors are installed, memory mirroring is set up as follows:
Table 10. Memory mirroring with two processors
DIMM Quadrant
DIMM 1, DIMM 2, DIMM 3, DIMM 4
DIMM 9, DIMM 10, DIMM 11, DIMM 12
The BladeCenter HX5 blade server also supports memory sparing, in which the contents of the failing DIMM
are transferred to the spare DIMM.
Notes:
• To enable memory sparing, the DIMMs installed for each processor must be identical.
• Memory sparing reserves memory capacity for failover in the event of a DIMM failure, and the reserved
capacity is subtracted from the total available memory. Memory sparing provides less redundancy than
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 33 for more information about memory requirements for the
IBM MAX5 expansion blade.
1
2
3
4
5
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
DIMM socket
6
7
8
9
10
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Mirrored Quadrant
DIMM 5, DIMM 6, DIMM 7, DIMM 8
Mirrored Quadrant
DIMM 5, DIMM 6, DIMM 7, DIMM 8
DIMM 13, DIMM 14, DIMM 15, DIMM 16
Chapter 3
11
12
13
14
15
X
X
X
X
X
X
X
X
X
X
X
X
X
.
Installing optional devices
16
X
X
X
X
41
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