Memory Tests
All memory tests are listed under Memory. These tests are described here.
An ECC error count test is automatically run after these tests complete.
Simple Memory Tests
Simple memory tests test the first 2.5 GB of memory. To test all memory, run extended
memory tests.
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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 different
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.
Appendix
Server Diagnostics Test Reference
47
Multicore Memory Tests
Multicore memory tests test the first 2.5 GB of memory using all available CPU cores.
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 1 GB of memory.
Test
Estimated completion time
Description
MP Block Checkerboard
5 seconds
Alternates 32-bit words with all
1s and all 0s, and then with all
0s and all 1s.
MP Bit Checkerboard
5 seconds
Alternates bits with all 1s and
all 0s, and then with all 0s and
all 1s.
MP Sequential Byte Block
8 minutes
Fills all bytes sequentially with
patterns starting at 0x00 and
ending at 0xFF.
MP Walking One
2 minutes
Walks 1s up and down memory.
MP Walking Zero
4 minutes
Walks 0s up and down memory.
MP Walking Spread Bit
4 minutes
Walks 0b01 up and then walks
0b10 down memory.
MP Walking Bit Flip
4 minutes
Alternates words with walking
1 and walking 0, and then
alternates words with walking 0
and walking 1.
Check Hardware Errors
1 second
Tests specific registers for
memory related errors. Running
this test at the end of memory
testing may help catch memory
errors generated during other
memory tests.
Extended Memory Tests
Extended memory tests test all available memory.
In Server Diagnostics EFI, all memory tests (simple, multicore, and extended) are
grouped under Memory tests.
The availability of extended memory tests depends on the server model you test.
Note: The time required to complete memory tests correlates to the amount of
memory being tested. These estimates are based on testing 1 GB of memory.
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Appendix
Server Diagnostics Test Reference
Test
Estimated completion time
Description
Extended Memory Test P00F
5 seconds
Tests memory using pattern 0.
This fails if an error occurs.
Extended Memory Test P01F
5 seconds
Tests memory using pattern 1.
This fails if an error occurs.
Extended Memory Test P02F
5 seconds
Tests memory using pattern 2.
This fails if an error occurs.
Extended Memory Test P03F
5 seconds
Tests memory using pattern 3.
This fails if an error occurs.
Extended Memory Test P04F
5 seconds
Tests memory using pattern 4.
This fails if an error occurs.
Extended Memory Test P05F
5 seconds
Tests memory using pattern 5.
This fails if an error occurs.
Extended Memory Test P06F
5 seconds
Tests memory using pattern 6.
This fails if an error occurs.
Extended Memory Test P07F
5 seconds
Tests memory using pattern 7.
This fails if an error occurs.