Apple Xserve Diagnostics Manuel d'utilisateur télécharger pdf (Page 31)

Appendix AXD Tools Test Reference 31

Hard Drive Tests

Memory (Simple) Tests

Simple memory tests test the first 2.5 GB of memory. To test all memory, run extended

memory tests.

Even though simple memory tests don’t test all memory, run these tests to detect

intermittent memory issues.

In AXD EFI tools, all memory tests (simple, multicore, extended, and SMBIOS) are

grouped under Memory tests.

Note: The time required to complete memory tests correlates to the size of memory

being tested. These estimates are based on testing 1 GB of memory.

Long Motor 15 seconds Verifies that the fan motor can reach

speeds of within 10% of its high and

low limits in 15 seconds. While the test

is running, all fans that aren’t being

tested are left under system control.

Long Motor Fans Full 15 seconds Verifies that the fan motor can reach

speeds of within 10% of its high and

low limits in 15 seconds. While the test

is running, all fans that aren’t being

tested are set to their maximum

speed. After the test completes, the

system regains control of the fan

speed.

Test Estimated completion time Description

Full Read 30 minutes for an 80 GB

drive; 4 hours for a 750 GB

drive

Performs a DMA full-read scan at 1250

RPM. This checks the entire hard drive

for slow-read failures.

Test Estimated completion time Description

Address as Data 5 seconds Tests memory using the memory

address as data

Patterns 25 seconds Tests memory using different data

patterns

Marching Ones and Zeros 15 seconds Tests memory by walking 1s and 0s

up and down memory

Knaizuk Hartmann 10 seconds Tests memory using this algorithm

MOD3 30 seconds Tests memory using this algorithm

Van de Goor’s March U 2 minutes Tests memory using this algorithm

Random Values 15 seconds Uses pseudo-random values

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Apple Xserve Diagnostics Manuel d'utilisateur Page 31