The administrator of virtual infrastructure needs to provision block storage for a VM with a business-critical application. How should the administrator attach the storage to the VM?

When provisioning block storage for a virtual machine, particularly for a business-critical application, using iSCSI is the most suitable choice. iSCSI (Internet Small Computer System Interface) is a protocol that allows SCSI commands to be sent over a TCP/IP network, enabling the storage area network (SAN) to be accessed over standard Ethernet networks.

iSCSI is designed specifically for block-level storage, which is essential for many applications requiring high performance and reliability. It demonstrates low latency and enables multiple clients to access the same storage devices, making it ideal for Virtual Machines that might need shared access to storage.

In contrast, NFS (Network File System) and CIFS (Common Internet File System) are protocols typically used for file storage. They operate at the file level rather than the block level, which makes them less suitable for applications that require block storage capabilities. NFS is often used in UNIX/Linux environments for sharing files, while CIFS is primarily used in Windows environments for file-sharing purposes.

IPv6 is a network layer protocol meant for addressing and routing, and it does not pertain directly to storage provisioning methods. It would not be relevant in the context of determining how to attach storage to a VM.

Thus, using iSCSI is