Storage Subsystem Administration Guide for Hitachi NAS Platform

Version: 15.7.x
Audience: anonymous
Part Number: MK-92HNAS012-37
Published: 2026-08-28

Understanding storage and tiering
Understanding tiered storage
Storage management components
System drives
Storage pools
Tiered storage pools
Dynamically provisioned volumes
File system types
Fibre Channel connections
About FC paths
Load balancing and failure recovery
Fibre Channel statistics
RAID controllers (HNAS Gateway only)
Managing the storage system
Supported Hitachi storage systems
Hitachi Dynamic Provisioning
HDP high-level process
Understanding HDP thin provisioning
Deciding how far to over-provision storage
Configuration considerations when using HDP with NAS
Using HDP to expand a span
Configuration guidelines for HNAS with HDP
Disable zero page reclaim
Storage pool chunks
Storage pool pre-allocation
Using HDP pools with a NAS server
Performing large file system expansions
Upgrading from older HNAS systems
Using HDP storage
Considerations when using HDP pools
Creating an HDP pool with untiered storage
Creating HDP pools with tiered storage
Storage pool naming
Creating a storage pool using the CLI
Creating a storage pool using the GUI
Adding the metadata tier
Allowing access to a storage pool
Creating storage pools with DP pools from HDP storage
Moving free space between storage pools
Important unmapper considerations
Using the unmapper to move space between storage pools
Thin provisioning using the NAS server filesystem-thin command
System drive groups and dynamic write balancing
Using a storage pool
Expanding storage pools
Expanding space in a thinly provisioned HDP storage pool
Expanding storage space using DP-Vols
Expanding a non-HDP storage pool or tier
Configuring automatic file system expansion for an entire storage pool
Renaming a storage pool
Reducing the size of a storage pool
Denying access to a storage pool
Deleting a storage pool
Managing flash storage
Expanding file systems on flash storage
Detecting free space on flash storage
Using compression statistics
Low physical space
Using SVOS Data Reduction (ADR)
Supporting external storage
Using UVM
Taking over a UVM span
Using multiple HDP pools
Expanding a UVM-based filesystem
Migrating data to a local cluster
Making efficient use of disk space
When to avoid block-level migration

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