Chris Evans from Architecting IT comments:
One of the subjects that was raised again at last week’s A3 IT Question Time in London was that of storage tiering. To recap, the concept is pretty straightforward; you install storage within an array or architecture that has multiple levels of performance and data is placed on the appropriate tier based on its performance requirements. In more complex environments, data can be dynamically moved between tiers as required. However I believe the tiering model as it exists today has come to the end of its useful life.
Every technology grows up eventually. In storage, the idea of tiering is on the way out thanks to high-speed flash SSDs and more available IOPS than any cluster could use effectively. Now it’s time to rethink the planning process to ensure we’re using the best solution going forward.
Read more at: Moving On From Storage Tiering