WeRecoverData

Hitachi Vantara Data Recovery

Hitachi's enterprise arrays are built around parity groups, LDEVs and Dynamic Provisioning pools, and the same architecture appears under several badges — Hitachi VSP, HPE XP, and historically Sun StorageTek high-end systems. HNAS comes from a different lineage entirely, the BlueArc hardware-accelerated NAS acquired in 2011.

On VSP systems, physical drives form parity groups, parity groups are divided into LDEVs, and LDEVs are pooled into Dynamic Provisioning pools from which host volumes are allocated. A pool volume failure can therefore affect many host LUNs at once, and pool metadata is as important as the data extents themselves.

The line runs from Lightning and Thunder through USP, USP V, VSP, VSP G/F series and the current VSP 5000 and VSP One families. Many production arrays are several generations old, so evaluations regularly involve platforms that are long past end-of-support.

HNAS presents SMB and NFS file systems using a hardware-accelerated file system with its own metadata structures, typically layered on VSP or AMS block storage behind it. A full HNAS recovery may require reconstructing both the block layer and the file system above it.

Common cases include parity group failures beyond the protection level, DP pool volumes taken offline, LDEVs deleted or reformatted, microcode upgrade failures, and HNAS file systems that will not mount after a controller or back-end event.

Hitachi Vantara Platforms

Related Recovery Services