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Introduction to Storage Virtualization

May 27, 2005

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Storage Virtualization: Technologies for Simplifying Data Storage and Management

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1.3 Chapter Summary

Storage Virtualization Overview

Storage virtualization depends upon lower layer standards but is not defined by a standards body.
Storage virtualization provides an abstraction layer over physical storage systems and enables multiple storage assets to be treated as a single logical entity.
Granular forms of storage virtualization occur in technologies such as RAID.
The value of storage virtualization is in its ability to automate tedious administrative tasks and reduce costs of storage management.
The Compaq ENSA initiative leverages storage virtualization for creation of a storage utility.
Storage virtualization must maintain reliable and transparent access to underlying storage assets.
Virtualization technology is being driven by all major storage providers.

Core Concepts

Virtualization provides a foundation of logical abstraction upon which more advanced functionality can be built.
To streamline storage operations, logical abstraction should support automation of routine administrative tasks.
Automated processes should be policy-based to further reduce manual intervention.
Logical abstraction, automation, and policy-driven management enable storage virtualization to support application-aware storage management.
The tight integration of operating systems and virtualization technology will enable applications to more fully leverage virtualized storage.
Storage virtualization facilitates interoperability of storage systems.
Virtualization technology can be supported on hosts, networks, or storage arrays and tape subsystems.
In-band virtualization provides both control and data along the same connection path.
Out-of-band virtualization separates control and data on different connection paths.
Not all storage environments require or benefit from virtualization.

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