Fujitsu M400R, M600R M200 Main Cabinet Memory configuration, Checking the memory diagnostics

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-resultscommand 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

20