The
active flash feature identifies the frequently accessed pages by counting the number of I/Os to specific pages. As shown in the following figure, pages that are accessed frequently are promoted to tier 1, and pages whose latest access frequency is low are allocated to lower tiers.
Dynamic Tiering (HDT) simplifies storage administration by automatically optimizing data placement in 1, 2, or 3 tiers of storage that can be defined and used within a single virtual volume. Tiers of storage can be made up of internal or external (virtualized) storage, and use of
HDT can lower capital costs. Simplified and unified management of
HDT allows for lower operational costs and reduces the challenges of ensuring applications are placed on the appropriate classes of storage.
