The solid state data center will still have tiers and something will need to manage it. Solid state tiering will be drawn across two lines: performance and durability. RAM still sets the performance bar, outperforming flash on both reads and (especially) writes. The other line that will be used to separate the solid state tiers is the durability of each type of solid state storage. Caching/tiering can no longer be looked at as a gateway to the solid storage data center, it says.”]
Source: https://www.darkreading.com/database-security/ssd-tiering-why-caching-won-t-die