Requirement of Storage I/O Control

B.

Storage I/O Control (SIOC) is a vSphere feature that helps to manage storage I/O resources by allocating and prioritizing them based on the virtual machine's needs. It provides a mechanism for the vSphere administrator to control the storage I/O resources consumed by virtual machines on a shared storage device.

The correct answer to this question is option C - Datastores with multiple extents.

Datastores with multiple extents are a requirement of Storage I/O Control (SIOC). A datastore extent is a contiguous space on a storage device that can be used by a datastore to store virtual machine files. Datastores with multiple extents span across multiple physical storage devices, which can provide better performance and higher capacity.

SIOC requires datastores with multiple extents to function properly because it needs to be able to monitor and control the storage I/O traffic across all the storage devices that the datastore spans. Without multiple extents, SIOC would not be able to accurately monitor and control the storage I/O traffic for the virtual machines running on the shared storage device.

Option A - Storage connected through Fibre Channel is incorrect because SIOC is storage-agnostic and does not require a specific storage protocol or connectivity type.

Option B - Management by a single vCenter Server is incorrect because SIOC can be managed by multiple vCenter Servers in linked mode.

Option D - Automated storage tiering capabilities is also incorrect because SIOC does not require automated storage tiering capabilities to function. However, automated storage tiering can be used in conjunction with SIOC to further optimize the storage I/O performance.