Which LUN configuration is also referred to as Thick Provisioning?

Thick Provisioning refers to a storage configuration strategy where the entire allocated capacity of a LUN is reserved upfront, regardless of whether all of that space is in use. This means that when space is provisioned for a virtual machine or application, it is fully allocated and dedicated, ensuring that the storage is readily available when needed.

In the context of the choices provided, Space Reserved LUNs with Thick Volume Provisioning most accurately represents this concept. This configuration protects against disk space allocation issues that may arise in environments where multiple applications have fluctuating storage needs. Since the space is reserved at the time of provisioning, it helps in avoiding performance degradation that may occur if the storage becomes full unexpectedly.

The other options involve different provisioning types. Dynamic Thin Provisioning and Space-efficient LUNs with Thin Volume Provisioning both refer to allocating more logical storage to applications than the physical space actually used at that moment, which leads to more efficient space utilization but without the guarantees that come with thick provisioning. Elastic Provisioning Configuration may refer to flexible or variable storage allocation strategies but does not specifically align with the concept of reserving storage upfront, which is key to thick provisioning.