Solid state storage auto tiering is an automated process for moving data that needs to accessed frequently to more expensive single-level cell (SLC) solid state storage. It also involves moving data that is not frequently accessed to less expensive multi-level cell (MLC) solid state media or other lower cost, higher capacity drives.
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Because SSDs are more expensive than ordinary hard disk drives (HDDs), IT shops typically need to reserve ultra-fast solid-state storage for their most mission-critical applications and input-output (I/O) intensive workloads. But manually tiering data can be cumbersome, especially if an application's performance requirements change frequently.
Tiering products, to varying degrees, provide options to define policies based on their individual needs. Compellent Data Progression, for example, offers both default policies for customers who have little or no storage management experience, and customizable policies for IT shops that want to tier by application, RAID level or other configuration options.