Creating HDP pools with tiered storage

Storage Subsystem Administration Guide for Hitachi NAS Platform

Part Number

Most storage pools reside on a single DP pool.

Important: The HNAS systems support up to two levels of tiered storage (Tier 0 and Tier 1).

With tiered storage, the metadata is kept on Tier 0 and the data on Tier 1. Tier 0 should be smaller than Tier 1, but should consist of faster storage. In general, the amount of real storage allocated for Tier 0 should be about 10% the size of Tier 1. The metadata Tier 0 contains is more compact than user data but is accessed more often. A single DP pool can support both the metadata and data tiers.