Which of the following descriptions about storage virtualization is correct? (Multiple choice)

Question

Options

• AStorage virtualization refers to adding a logical layer to the storage device, and users access or
• BThe advantage of storage virtualization based on storage devices is that it does not occupy host
• CIt is difficult to implement host-based storage virtualization, and the cost of equipment is high
• DStorage virtualization is to abstract storage devices into data storage. Virtual machines are stored

• A
  78% (39)
• C
  22% (11)

Explanation

Options A, B, and D are correct because they each accurately describe a key aspect of storage virtualization: A correctly defines it as adding a logical abstraction layer between physical storage and users; B correctly identifies that device-based (storage-side) virtualization offloads processing to the storage hardware, freeing the host's CPU and memory; and D correctly describes the abstraction of physical storage into virtual storage pools accessible to virtual machines.

Option C is the distractor and is wrong because it inverts reality - host-based storage virtualization is actually the simplest and cheapest approach, implemented via software agents on the host server with no specialized hardware required. Its real drawback is that it does consume host CPU and memory resources, not that it is costly or difficult.

Memory tip: Think of the three valid implementation layers - host (cheap/software, but uses host resources), network/fabric (middle ground), and device (hardware-based, no host overhead but more expensive). C incorrectly attributes "expensive and difficult" to the host layer, which is the opposite of the truth - so flag any answer that calls host-based virtualization costly.

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