Apple Xserve - Apple Xserve Diagnostics (Version 3X103) Manuel d'utilisateur télécharger pdf (Page 33)

Appendix AXD Tools Test Reference 33

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, and extended) 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.

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

Block Checkerboard 32 10 seconds Alternates 32-bit words with all 1s and

all 0s, and then with all 0s and all 1s

Bit Checkerboard 32 10 seconds Alternates bits with all 1s and all 0s,

and then with all 0s and all 1s

Sequential Byte Block 32 14 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

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 39

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Apple Xserve - Apple Xserve Diagnostics (Version 3X103) Manuel d'utilisateur Page 33