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SSDs, TRIM, and Available Disk Space |
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| Sat, January 23 2010 | 12:03PM | PermaLink |
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There is a lot of discussion on forums about the impact of
available disk space on SSD performance. A pertinent question was raised;
At what point does drive utilization impact SSD performance? Running some
quick tests, the results proved rather insightful. ... These test results
demonstrate that drive performance is not directly related to available
disk space - performance is relatively equivalent between a drive that's
half full and a drive that's almost completely full. ... So if drive
utilization is just a bit of seasoning in the SSD performance cuisine, why
are people seeing the advantages they are seeing from over
provisioning/short stroking? The improvements they are leveraging are a
direct result of how TRIM/GC is implemented at the firmware/OS level. This
implementation limits the drives performance relative to the amount of
available disk space which can be utilized for TRIM/GC. More available
space, lends itself to more efficient TRIM/GC operation, thereby improving
real world performance.
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