Apple Xserve Diagnostics - Manual (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
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