Hitachi VSP G400 User Guide

Note: Because Snapshot data A and Snapshot data B are handled as a Thin
Image S-VOL of a snapshot pair, the host can reference the P-VOL, Snapshot
data A, and Snapshot data B.
Components of Thin Image
Hitachi Thin Image typically consists of several components, including pairs,
groups, and software applications. Thin Image requires Dynamic Provisioning,
which is used to access data for open-system servers such as UNIX and PC
servers in a pool volume through a virtual volume.
Thin Image components:
• Hitachi Thin Image pairs (clone and snapshot pairs).
• Volume related components (P-VOL, S-VOL, and pools)
• Snapshot tree related components (root volume, node volumes, and leaf
volumes)
Groups:
• Consistency groups
• Snapshot groups
Software applications for VSP family storage systems:
• Hitachi Thin Image
• Dynamic Provisioning (HDP)
• Command Control Interface (CCI)
You can run CCI commands to perform Thin Image tasks (see Pair tasks
using CCI or Device Manager - Storage Navigator on page 212).
Thin Image pairs
This table describes Thin Image pairs.
Type
Volume that can
be used as P-VOL
Volume that can
be used as S-VOL
Cascade
capability
Description
Pairs with the
snapshot attribute
Logical volume
(LDEV)
Thin Image V-VOL
(V-VOL of which
provisioning type
is Snapshot)
No
Pairs used to
store snapshot
data.
The logical
volume of the P-
VOL contains DP-
VOLs (V-VOL of
which provisioning
type is Dynamic
Provisioning).
DP-VOL Yes
Pairs used to
store snapshot
data. To create a
cascaded pair with
18 Overview of Thin Image
Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series

Hitachi VSP G400 Specifications

General

Brand	Hitachi
Model	VSP G400
Category	Storage
Language	English