Apple Xserve Diagnostics Bedienungsanleitung PDF herunterladen (Seite 36)

36 Appendix AXD Tools Test Reference

Memory (SMBIOS) Tests

SMBIOS tests check to see if memory has been mapped out correctly. When the Xserve

tests memory at startup, it automatically maps out bad memory. Mac OS X doesn’t see

this mapped out memory, so the non-SMBIOS memory tests don’t test it. The SMBIOS

test reports these mapped out DIMMS.

Because memory is mapped only once, you should run this test once and not loop it.

Memory (ECC) Tests

When an ECC error occurs, memory catches the problem and and fixes it. When you run

other memory tests, the tests don’t realize an error has occurred. The ECC tests detect

these memory fixes and report them. After you run ECC tests, the results are reset, so

running the ECC tests again might result in success even though the previous test

resulted in failure.

The ECC memory test should be run before running any other memory tests, catching

any ECC errors generated by the system memory tests that were run at startup. After

you run other memory tests, you should also run the ECC tests once more to see if the

memory tests have trigged any ECC errors.

Fan Tests

Test Estimated completion time Description

SMBIOS Self-Test 1 second Checks the SMBIOS tables for 32-bit

errors (type 18) and 64-bit errors (type

33). Also verifies that the mapped-in

DIMM size is appropriate for the slot

it’s inserted into. If there’s a size

mismatch, an error occurs.

Test Estimated completion time Description

ECC Error Count 1 second Reports the number of ECC errors, and

then resets the count

Test Estimated completion time Description

Verify Motor +/– 10%,

10 Reads High, 20 Low

2 minutes Verifies the minimum and maximum

fan speeds. Sets the minimum and

maximum builds within 10% of the

threshold and then does 10

consecutive reads at the maximum

and 20 at the minimum.

Verify Motor Automatically +/

– 15%

2 minutes Verifies the minimum and maximum

fan speeds. Sets the minimum and

maximum builds within 15% of the

threshold.

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