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Table 7. System memory configuration for a two processors (two processors)
Installed memory
2 DIMMs
4 DIMMs
6 DIMMs
8 DIMMs
10 DIMMs
12 DIMMs
14 DIMMs
16 DIMMs
Important: If you are installing memory in a scalable blade complex, install the DIMMs to have a balance of
memory among processors. Additional memory can be installed in the topmost BladeCenter HX5 blade
server of the scalable blade complex 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 that consists of two BladeCenter
HX5 blade servers, you would install two DIMMs (in connectors 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 8. 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 9. 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
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
X
X
X
X
X
X
X
X
X
X
DIMM connector
6
7
8
9
10
X
X
X
X
X
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 4
Removing and replacing blade server components
11
12
13
14
15
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
16
X
X
X
X
X
105
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