On 07/20/2011 02:13 PM, Werner Fischer wrote:
There is a paper from Intel "Over-provisioning an Intel® SSD" (analyzing
X25-M 160 GB Gen.2 SSDs):
http://cache-www.intel.com/cd/00/00/45/95/459555_459555.pdf
On page 10 of this Intel presentation they mention that a spare area
27% of native capacity has diminishing returns for such an SSD:
http://maltiel-consulting.com/Enterprise_Data_Integrity_Increasing_Endurance.pdf
(This latter document is password protected.)
The first document, though, claims almost linear benefit (regarding IOs/sec)
from much higher amounts of over-provisioning. Alas, their chart does not extend
into the region where saturation of the effect must occur for sure.
Regards,
Lutz Vieweg
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