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January 14, 2008
Server and Storage Virtualization: A Complete Solution
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Server virtualization is an important step toward improving overall IT efficiency. Virtual machine technology reduces the complexity and management of disparate server hardware and OS platforms. Nonetheless, server virtualization is only one component in a truly virtual enterprise infrastructure. Another critical component is storage virtualization.
Similar to server virtualization, storage virtualization creates a logical layer of storage from physical storage devices. The full benefits of server virtualization can only be realized in combination with a virtual storage layer that works in conjunction with and complements the virtual server layer. For example, dynamic virtual machine failover, a key benefit of leading server virtualization solutions, can facilitate disaster recovery. It is incomplete, however, without dynamic storage failover, a storage virtualization feature. Implementing storage virtualization, in other words, extends the benefits of an investment in server virtualization and builds upon them, providing simplified storage management, improved storage utilization and application performance, a bullet-proof disaster recovery solution, and a diminished need for proprietary vendor solutions.
Business Drivers for Storage Virtualization
The business drivers for storage virtualization are much the same as those for server virtualization. CIOs and IT managers must cope with shrinking IT budgets and growing client demands. They must simultaneously improve asset utilization, use IT resources more efficiently, ensure business continuity and become more agile. In addition, they are faced with ever-mounting constraints on power, cooling and space.
Key Benefits of Storage Virtualization
Storage virtualization provides companies with tools to address the underutilization of resources and the poor economics of silo-based storage, as well as the flexibility to respond to changing business requirements. In a storage virtualized environment, organizations achieve the full benefits of consolidation, improved resource usage and comprehensive disaster recovery. Storage virtualization also dramatically reduces power and cooling costs.
The Intelligent Network Switch: A New Approach to Storage Virtualization
Intelligent network switches with built-in storage management services, such as SANRAD's V-Switch, have changed the virtual storage paradigm from a model of expensive proprietary vendor lock-in to one of low-cost open support for total storage flexibility. Open storage virtualization enables IT managers to improve overall storage utilization by allowing capacity from any storage array to be combined in centrally managed, virtual storage pools. IT managers can dynamically reduce capacity for applications that are not growing and reuse that capacity for those which are. This can eliminate the need to procure new storage or, at a minimum, delay acquisition.
Intelligent network switches also enable organizations to easily link storage hardware and software solutions from multiple storage vendors, removing the burden of proprietary vendor lock-in and simplifying tasks such as data replication, mirroring and data migration. For example, when a storage network is comprised of disparate systems, even from the same vendor, data migration is time-consuming and application-disruptive. In a typical scenario, the application is taken offline, data is moved to tape and then restored. Intelligent integrated network switches permit data to be migrated in real time, from any storage array to any other storage array, without taking applications offline. Storage virtualization utilizing intelligent switches provides non-disruptive online migration that eliminates downtime and greatly reduces administrators' involvement in data or server migration.
Other benefits include a common set of management, provisioning and replication tools that lower the total cost of ownership (TCO) by reducing the number of tools and people necessary to manage storage and eliminating the requirement to purchase multiple licenses for every storage device.
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