Linux: With NFS, why can't I see disk usage for the second mount point?

In an NFS (Network File Sharing) environment with Linux® hosts, when one NFS directory is mounted to two mount points, the disk usage for the second mount point on the Linux host is not displayed on the Disks tab of the Host Properties window on the cluster management console.

This issue occurs only on Linux hosts, when the same NFS directory is mounted to two mount points (for example, if SymphonyNFS is mounted on mount point /home/testnfs1 and /home/testnfs2). In this case, disk usage data is displayed based on NFS, not the mount point (for example, disk usage data is displayed only for /home/testnfs1).