Lenovo BladeCenter HX5 1909, Problem Determination And Service Manual

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Table 7. System memory configuration for a two processors (two processors)
Installed memory
DIMM connector
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
2 DIMMs X X
4 DIMMs X X X X
6 DIMMs X X X X X X
8 DIMMs X X X X X X X X
10 DIMMs X X X X X X X X X X
12 DIMMs X X X X X X X X X X X X
14 DIMMs X X X X X X X X X X X X X X
16 DIMMs X X X X X X X X X X X X X X X X
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 Mirrored Quadrant
DIMM 1, DIMM 2, DIMM 3, DIMM 4 DIMM 5, DIMM 6, DIMM 7, DIMM 8
If two processors are installed, memory mirroring is set up as follows:
Table 9. Memory mirroring with two processors
DIMM Quadrant Mirrored Quadrant
DIMM 1, DIMM 2, DIMM 3, DIMM 4 DIMM 5, DIMM 6, DIMM 7, DIMM 8
DIMM 9, DIMM 10, DIMM 11, DIMM 12 DIMM 13, DIMM 14, DIMM 15, DIMM 16
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
Chapter 4
.
Removing and replacing blade server components
105