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4.3 Systemboard
Processor Configuration
Up to 4 CPU can be installed in the M400A main cabinet. When installing the processor modules,
the following conditions must be satisfied:
The installed processor modules must be the same type (including the cache size).
Install a processor module in slot 0 before installing one in slot 1.
When installing a processor module, install DC-DC converters alog with the processor in the
corresponding slot.
IMPORTANT
If any of the above conditions is not satisfied, the operation is not guaranteed.
Memory configuration
Using the Expansion System Board’s option the M400A has 32 memory slots, allowing for as much
as 8 gigabytes of main memory. When installing the memory modules, the following conditions
must be satisfied:
When installing the first set of DIMM, install a set of 4 modules of same size in slots 0, 1, 2,
and 3.
At subsequent memory expansions, install a set of 4 modules of the same size in slots 4, 5, 6, 7,
and 8, 9, 10, 11, then 12, 13, 14, 15.
The same memory installation rules ( described above ) apply when using the Expansion
System Board.
IMPORTANT
If any of the above conditions is not satisfied when installing the DIMMs, some DIMMs are
degraded in the power-on diagnostics. When expanding the memory modules, check that
the DIMMs are installed correctly.
Memory ECC feature
The SDRAM DRAM is used as the memory chip. The single-bit error correction and multiple-bit
error detection features are available for a large capacity memory by using the Error Check Code
(ECC) system. A single-bit error can be isolated down to the memory slot on which it occurred. A
multiple-bit error can be isolated down to the pair of slots on which it occurred.
Checking results of the memory diagnostics
To check that the system recognizes installed memory modules correctly, execute the
"show-post-results" command at the ok prompt. A module that does not satisfy any
condition described in "Memory configuration" or a module judged to be faulty by memory
diagnostics is treated as an invalid module. The screen below lists the command execution results
related to memories and their meanings.
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