Virtualization

Three basic categories for Storage Virtualization:
1. What is being virtualized
2. Where the virtualization occurs
3. How it is implemented.

What is being virtualized may include disks (cylinder, head, and sector virtualized into logical block addresses), blocks (logical blocks from disparate storage systems may be pooled into a common asset), tape systems (tape drives and tape systems may be virtualized into a single tape entity, or subdivided into multiple virtual entities), file systems (entire file systems may be virtualized into shared file systems), and file or record virtualization (files or records may be