Qtier is a proprietary automated-tiering technology, designed to increase NAS storage performance and reduce the total cost of NAS ownership.
With Qtier, a storage pool can contain a mixture of solid-state drives (SSDs), hard disk drives (HDDs), and Serial Attached SCSI (SAS) drives. QTS creates a separate storage tier for each disk type, and then moves data between the tiers based on access frequency. Frequently accessed data is moved to the fastest disks for greater read and write performance. Infrequently accessed data is moved to the slower high-capacity disks for more cost effective data storage.