Apple Server Diagnostics Manuel d'utilisateur télécharger pdf (Page 46)

46 Appendix Server Diagnostics Test Reference

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

detect intermittent memory issues.

In Server Diagnostics EFI, all memory tests (simple, multicore, and extended) are

grouped under Memory tests.

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

memory being tested. These estimates are based on testing 2 GB of memory.

Test Estimated completion time Description

Address as Data 5 seconds Tests memory using the

memory address as data.

Patterns 10 seconds Tests memory using dierent

data patterns.

Marching Ones and Zeros 10 seconds Tests memory by walking 1s and

0s up and down memory.

Knaizuk Hartmann 5 seconds Tests memory using this

algorithm.

MOD3 15 seconds Tests memory using this

algorithm.

March U 1 minute Tests memory using Van de

Goor’s March U algorithm.

Random 15 seconds Uses pseudo-random values.

Block Checkerboard 32 5 seconds Alternates 32-bit words with all

1s and all 0s, and then with all

0s and all 1s.

Bit Checkerboard 32 5 seconds Alternates bits with all 1s and

all 0s, and then with all 0s and

all 1s.

Sequential Byte Block 32 9 minutes Fills all bytes sequentially with

patterns starting at 0x00 and

ending at 0xFF.

Walking One 32 5 minutes Walks 1s up and down memory.

Walking Zero 32 5 minutes Walks 0s up and down memory.

Walking Spread Bit 32 5 minutes Walks 0b01 up and then walks

0b10 down memory.

Walking Bit Flip 32 5 minutes Alternates words with walking

1 and walking 0, and then

alternates with walking 0 and

walking 1.

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Apple Server Diagnostics Manuel d'utilisateur Page 46