# NAS Transport Mode

The NAS (network attached storage) transport mode enables the virtual server agent (VSA) proxy computer to read data directly from the network file server (NFS), without transferring data over the local area network (LAN).

When the VSA proxy is not in the Nutanix AHV cluster environment, this mode is automatically selected.

The following operations support the NAS transport mode:

- Streaming backup operations

- IntelliSnap backup operations

- Backup copy operations

## Benefits

- The NAS transport mode enables VSA proxy computers that are not in the cluster environment to read directly from the NFS.

- The NAS transport mode does not require a proxy host computer.

- The NAS transport mode can reduce the need for mount operations.

- The NAS transport mode increases the performance of streaming backup operations, IntelliSnap backup operations, and backup copy operations because the data is directly transferred from the NFS to the proxy computer (which is the MediaAgent).

## System Requirements

- VSA proxies must have access to NFS exports from the NFS server.

- The proxy machine must be able to access the NFS ports for the destination NFS server behind any firewall configuration.

- When running as root, libnfs tries to allocate a system port for its connection to the NFS server. When running as non-root, libnfs uses a normal ephemeral port. By default, many NFS servers do not allow non-system ports to connect. For these NFS servers, you must use the "insecure" export option in /etc/exports to allow libnfs clients to connect.

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