Functions overview for active flash and Dynamic Tiering

Tier management is performed by both active flash and Dynamic Tiering. The differences in supported functionality are included in the table below.

Category

Functions

active flash

Dynamic Tiering

Initial page allocation

Assigning new pages to the write data of the host

Supported

Supported

Monitoring of performance

Monitoring tiers based on the specified cycle time

Supported

N/A

Tier relocation

Promoting pages to the tier which is determined by the scheduled performance monitoring

Supported

Supported

Promoting pages from the tier 2 or 3 to tier 1, the pages where the latest access frequency is suddenly high

Supported

N/A

To maintain capacity in the tier 1, demoting pages from the tier 1 to tier 2 or 3, the pages where the latest access frequency is low

Supported

N/A

Parent Topic
  • Dynamic Tiering and active flash

    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.