What is the purpose of an automatic migration policy in a tiered storage system?

• A. Manual migration only
• B. Automatic migration policy
• C. No migration policy
• D. Fixed-tier migration

Answer: (B)

In a tiered storage setup, there are multiple storage types with different performance and cost. An automatic migration policy makes the system move data between these tiers on its own, using predefined rules about how the data is used. For example, it might promote frequently accessed data to a faster tier and demote infrequently accessed data to a cheaper, slower tier. This keeps active data on the right storage for performance while reducing costs for less-used data, all without requiring manual actions. If there were no automatic policy, data would stay put or require manual moves, and a fixed-tier approach would trap data on a single tier even as usage changes, preventing optimization.