We have all heard for years about tiered data storage for disk arrays. Tier 1 is usually enterprise disk, which was once Fibre Channel but more and more is becoming SAS. Tier 2 is typically enterprise SATA, while tier 3 might be consumer-grade drives. And the last year or two has seen the rise of a tier 0 for flash-based solid state drives (SSDs).
There are big differences between each of the tiers in terms of reliability, performance, data integrity and cost, especially for tier 0 SSDs. Here is a quick review of some of the major differences between the disk tiers:
This table does not include SSDs, of course, which have a wide range of reliability and performance and might need their own tiers.
Read the rest at Enterprise Storage Forum.