According to the web search results, Distributed Storage Fabric (DSF) is the scale-out storage technology that makes HCI and cloud possible45. DSF pools the storage devices that are directly attached to a cluster of servers and presents them to applications across a variety of storage protocols4. DSF also manages and protects data by a fine-grained, distributed metadata system that ensures uniform distribution of data throughout the cluster to eliminate hot spots and speed up rebuilds

According to the How to use the cvm_shutdown script web search result3, the cvm_shutdown script signals HA when shutting down the CVM (Controller VM) to forward the storage traffic to another healthy CVM.
Instead of using sudo shutdown or sudo reboot commands, this script should be used to minimize I/O hits in user VMs running on the present hypervisor host. The cvm_shutdown -P now command will initiate the shutdown process on the CVM immediately. Therefore, if the administrator needs to perform an orderly shutdown of the CVM, they should execute this command from the CVM.

https://portal.nutanix.com/page/documents/details/?targetId=Web-Console-Guide-Prism-v50:wc-block-services-enabling-t.html Provision storage on the Nutanix cluster by creating a volume group. Create a client whitelist to enable access to the volume group by using the IP addresses or client initiator IQNs in a whitelist (as part of the volume group configuration). Create a secret for the volume group if you are using CHAP authentication.

When a placement policy is enforced, images are only allowed to be deployed on clusters that are part of categories that are associated with the policy. If the desired cluster is not associated with the policy, then the image will not be available for deployment.
https://next.nutanix.com/how-it-works-22/image-management-for-ahv-clusters-and-dealing-with-the-inactive-im