Troubleshooting Nutanix Error 6647 "Nutanix Plugin getMountPath: Failed to mount"

Problem

Nutanix Backups require the ability for the Backup Host to mount NFS mountpoint from Nutanix AHV snapshot.  If the whitelist or firewall is not configured correctly NetBackup will fail with error 6647.

Error Message

nbaapidiscv log:

13:02:06.083 [66396.66396] <16> aapi_logmsg: session_id: v1.0 2017_03 Nutanix Plugin getMountPath: Failed to mount ::/<VM>/.snapshot/02/30539-1591123350501256-64002/.acropolis/vmdisk; Error: Permission denied. You may want to check whether you have added the backup host to the Nutanix Acropolis Cluster using the appropriate whitelist option available through the Prism web console or its command line interface.

Cause

The Backup host cannot mount the NFS share on the Nutanix AHV cluster.

Solution

Review the Nutanix Whitelist and Firewall settings to verify the Backup Host can access the Nutanix devices.

They are some commands on the Linux backup host you can use to determine the problem is not on the NetBackup side:

# showmount -e <nutanix_cluster>

You can also try to mount the NFS manually:

# mount -t nfs <ip_of_nutanix>:/<nfs_share_name> /<location_to_mount_it>/

If this does mount then you should run

umount /<location_to_mount_it>/