Dynamic Tiering and active flash

Parent Topic

• Configuring thin provisioning

  Thin provisioning technology allows you to allocate virtual storage capacity based on anticipated future capacity needs, using virtual volumes instead of physical disks. Thin provisioning is an optional provisioning strategy for your storage systems. Thin provisioning is implemented by creating one or more Dynamic Provisioning pools (DP pools) of physical storage space.

Child Topics

• About tiered storage
• Tier monitoring and data relocation
• Multi-tier pool
• Tier monitoring and relocation cycles
• Tier relocation workflow
• Tier relocation rules, restrictions, and guidelines
• Buffer area of a tier
• Setting external volumes for each tier
• Execution modes for tier relocation
• Relocation speed
• Monitoring modes
• Downloading the tier relocation log file
• Tiering policy
• Changing new page assignment tier of a V-VOL
• Opening the Edit Tiering Policies window
• Changing a tiering policy name

  Use this procedure to change a tiering policy name.

• Changing an allocation threshold

  Use this procedure to change an allocation threshold.

• Changing relocation priority setting of a V-VOL
• 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.

• Relocating pages whose latest I/Os frequency is suddenly high by active flash

  The active flash feature identifies the frequently accessed pages by counting the number of I/Os to specific pages. Pages that are accessed many times are promoted to tier 1. Pages where the latest access frequency is low are allocated to lower tiers.

• Dynamic Tiering workflow
• Active flash workflow

  The active flash feature of Dynamic Tiering can be set up using either Device Manager - Storage Navigator or Command Control Interface.

• Dynamic Tiering, active flash tasks and parameters
• Managing Dynamic Tiering and active flash
• Viewing pool tier information
• Viewing DP-VOL tier information