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Types of storage virtualization

There are several ways to implement a virtualized storage environment. Here are the three most common.

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By Deni Connor
Network World, 03/11/02

 Type of virtualization  Pros  Cons
  • Separate device; does not burden other network devices.
  • More fully functioned version of software.
  • Independent of storage devices.
  • Dependent on operating system.
  • Increased overhead on server.
  • All servers must implement.
  • Access to storage array is more limited than array-based systems.
  • Gives extra functionality to switch.
  • Management on same platform.
  • Lets mainframe Enterprise Systems Connection or other
    • forms of storage be added.
  • Allows aggregation over MANs/WANs.
  • Appliance CPU and memory latency.
  • Limited by appliance reliance on server platform.
  • Appliance downtime could result in failure of virtualization and access to storage.
  • Access to storage array is more limited than array-based systems.
  • Eliminates extra device.
  • Adds functionality to array.
  • Independent of operating system.
  • Intelligence in device being virtualized allows extra functionality.
  • Requires that all users have access to storage array.
  • Management services are vendor-specific.

Related Links

Contact Senior Editor Deni Connor

Other recent articles by Connor

Every byte into the pool
What if you could somehow aggregate all your storage from any type of physical device into a single pool that could be easily accessed and centrally managed? That's the promise of virtualization.

Plunging into virtualization
Plumbers & Pipefitters National Pension Fund rolls out DataCore's SANsymphony to improve storage manageability.

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