Apple Xserve Diagnostics - Manual (Page 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.