This KB outlines the steps to list mounted and unmounted volumes along with steps on how to mount and unmount NFS and VMFS Datastore.
VMware ESXi 7.x
VMware ESXi 8.x
Use the esxcli storage filesystem command to list mounted volumes, mount volumes, and to unmount a volume.
Also, specify whether to persist the mounted volumes across reboots by using the --no-persist option:
esxcli storage filesystem list
# Note in the example below there is no listed mount point for the unmounted datastore and the "mounted status" is false
esxcli storage filesystem mount --volume-label=<label>|--volume-uuid=<VMFS-UUID>
esxcli storage filesystem unmount --volume-label=<label>|--volume-uuid=<VMFS-UUID>
esxcli storage nfs remove -v NFS_Datastore_Nameesxcfg-nas -d NFS_Datastore_Name