SSD: What are the differences between caching and tiering?
Differences Between SSD Caching and Tiering Technologies
The terms tiering and caching are often used interchangeably, but actually refer to two different storage acceleration techniques. Both techniques involve placing frequently accessed -- hot -- data onto a high-speed medium such as flash, but the similarities between the two mostly end there.
This expert e-guide takes a closer look at SSD caching, how caching and tiering are alike, and some caching and tiering challenges.