I’ve given more thought overprovisioning since I mentioned it as a possible way to reduce cache housekeeping delays. If I personally bought a 64 Gb SSD cache drive, I’d probably run it in the 50-60 Gb range rather than half of that to overprovision. In other words I’d accept reduced longevity and occasional housekeeping delays to gain additional files cached.
Another issue is marketing. Although one could justify overprovisioning a small SSD used as a cache due to the relatively low total cost of going from 32 to 64 Gb of NAND, what about a 1Tb SSD? How are you going to sell increased reliability for one product and not another? I can see it for ‘mission critical’ enterprise level cost relatively no object installations but for the home market, “I can give you TWICE the storage for the same money” would be impossible (IMO) to beat.
