Apple Server Diagnostics - Manual (Page 52)

52 Appendix Server Diagnostics Test Reference
Fan Tests
When Server Diagnostics Mac OS X starts, it performs a hardware existence test. All
fans found during this test can be tested individually using fan tests.
Test Estimated completion time Description
Verify Motor +/– 10%, 10 Reads
High, 20 Low 2 minutes Verifies the minimum and
maximum fan speeds. Sets the
minimum and maximum builds
within 10% of the threshold and
then does 10 consecutive reads
at the maximum and 20 at the
minimum.
Verify Motor Automatically
+/– 15% 2 minutes Verifies the minimum and
maximum fan speeds. Sets the
minimum and maximum builds
within 15% of the threshold.
Hard Drive Tests
When Server Diagnostics Mac OS X starts, it performs a hardware existence test. All
hard drives and solid-state drives found during this test can be tested individually
using hard drive tests.
Test Estimated completion time Description
Threaded Surface Scan 2 hours for an 500 GB drive;
3 hours for a 1 TB drive Scans the entire surface of a
hard drive.
Threaded Surface Short Scan 3 minutes Scans the first 10 GB of a hard
drive.
Check SMART Status 1 second Checks the SMART status of a
hard drive.
Short Random Multi-block 7 minutes Performs a threaded, random
multi-block read of random
ranges of the target hard drive.
This isn’t a full surface scan,
but it causes rapid seeking and
reading of hard drive blocks. If
a block can’t be read, an error
occurs.
Memory Tests
All memory tests are categorized here.
Simple Memory Tests
Server Diagnostics Mac OS X memory tests test the first 2.5 GB of memory. All
multicore memory tests listed in Server Diagnostics EFI are run.