What is a benefit of virtual storage provisioning over traditional provisioning?

Question

Options

• AEnables more efficient allocation of storage to hosts
• BCan be used for applications that require predictable performance
• CProvides full control for precise data placement
• DDoes not enable oversubscription

• A
  74% (39)
• B
  4% (2)
• C
  17% (9)
• D
  6% (3)

Explanation

Virtual Storage Provisioning Virtual provisioning enables creating and presenting a LUN with more capacity than is physically allocated to it on the storage array. The LUN created using virtual provisioning is called a thin LUN to distinguish it from the traditional LUN. Thin LUNs do not require physical storage to be completely allocated to them at the time they are created and presented to a host. Physical storage is allocated to the host "on- demand" from a shared pool of physical capacity. A shared pool is consists of physical disks. A shared pool in virtual provisioning is analogous to a RAID group, which is a collection of drives on which LUNs are created. Similar to a RAID group, a shared pool supports a single RAID protection level. However, unlike a RAID group, a shared pool might contain large numbers of drives. Shared pools can be homogeneous (containing a single drive type) or heterogeneous (containing mixed drive types, such as flash, FC, SAS, and SATA drives). Virtual provisioning enables more efficient allocation of storage to hosts. Virtual provisioning also enables oversubscription, where more capacity is presented to the hosts than is actually available on the storage array. Both shared pool and thin LUN can be expanded nondisruptively as the storage requirements of the hosts grow. Multiple shared pools can be created within a storage array, and a shared pool may be shared by multiple thin LUNs.

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