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CHAPTER 2 M200 Main Cabinet
Memory configuration
The M200 has 16 DIMM slots, allowing for as much as 4 gigabytes of main memory. When
installing the DIMMs, the following conditions must be satisfied:
When installing the first set of DIMM, install a set of 4 modules of the same size in slots 0 to 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.
IMPORTANT
If any of the above conditions is not satisfied when installing the DIMMs, some DIMMs are
degraded in the power-on diagnostics. When adding the memory modules, check that the
DIMMs are installed correctly.
Memory ECC feature
The EDO DRAM is used as the memory element. The single-bit error correction and multiple-bits
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 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.
Example for normal operation
=== Memory =========
Type : EDO
SLOT# Size[Valid(MB)/Existing(MB) Total
0-3 32/32 32/32 32/32 32/32 : 128/128 MB
4-7 32/32 32/32 32/32 32/32 : 128/128 MB
8-11 ----- ----- ----- ----- : 0/0 MB
12-15 ----- ----- ----- ----- : 0/0 MB
*=Error SLOT
In this example, a memory module has been placed in degraded mode.
=== Memory =========
Type : EDO
SLOT# Size[Valid(MB)/Existing(MB) Total
0-3 32/32 32/32 32/32 32/32 : 128/128 MB
4-7 0/32 0/0* 0/32 0/32 : 0/96 MB
8-11 ----- ----- ----- ----- : 0/0 MB
12-15 ----- ----- ----- ----- : 0/0 MB
*=Error SLOT
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