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over provisioning (SSD overprovisioning)

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over provisioning (SSD overprovisioning)

Overprovisioning, sometimes spelled over-provisioning, is the inclusion of extra storage capacity in a flash solid state drive (SSD). The extra capacity is not visible to the host as available storage.

SSD overprovisioning can increase the endurance of a solid state drive by distributing the total number of writes and erases across a larger population of NAND blocks and pages over time. It can also improve performance by giving the flash controller additional buffer space for managing program/erase (P/E) cycles and improving the probability that a write operation will have immediate access to a pre-erased block.

To provision is “to provide” or make something available.

Related glossary terms: solid state drive (SSD) capacity, stand-alone solid state storage (SSS), solid state module (SSM), RAM-based solid state drive (SSD), client solid state drive (SSD), queue depth, Fast Guide to RAM, semiconductor fab, flash cache appliance, floating gate

This was last updated in January 2012

Posted by: Margaret Rouse

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