Apple 3X108 manual Hard Drive Tests, Memory Tests

Hard Drive Tests

When Server Diagnostics EFI starts, it performs a hardware existence test. Hard drives found during this test can be tested individually using hard drive tests.

Test	Estimated completion time	Description
Full Read	3 hours for a 1 TB drive	Performs a DMA full-read scan
		at 1250 RPM. This checks the
		entire hard drive for slow-read
		failures.
		This test is available for hard
		drives, but not solid-state drives.
Abbreviated Read	2 minutes	Performs a DMA scan at 1250
		RPM. This checks the first 10 GB
		of the hard drive for slow-read
		failures.
		This test is available for hard
		drives, but not solid-state drives.
Check SMART Status	1 second	Check the SMART status of
		a hard drive.
		This test is available for hard
		drives, but not solid-state drives.

Memory Tests

Simple Memory Tests

In Server Diagnostics EFI, 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 8 GB of memory.

Test	Estimated completion time	Description
Address as Data	15 seconds	Tests memory using the
		memory address as data.
Patterns	40 seconds	Tests memory using different
		data patterns.
Marching Ones and Zeros	30 seconds	Tests memory by walking 1s and
		0s up and down memory.
Knaizuk Hartmann	20 seconds	Tests memory using this
		algorithm.
MOD3	1 minute	Tests memory using this
		algorithm.
March U	3 minutes	Tests memory using Van de
		Goor’s March U algorithm.

40

Appendix    Server Diagnostics Test Reference