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# Create or modify file interfaces

Network-attached storage is a file-level storage architecture that makes stored data more accessible to networked devices.

## About this task

See Understanding PowerMax File for storage systems for an overview of File.

The File Interfaces can be configured without having a defined subnet on the physical ports. Instead, file interfaces can be configured with a subnet mask or prefix length.

Multiple File Interface can be created on a NAS server. Production network interfaces are used for all file protocols and services of the NAS server. Backup network interfaces are used only for NDMP/NFS backup. A device on the primary or backup node can be a virtual port or link aggregation on which the network interface is running. Gateway is an optional attribute.

## Steps

1. Select a storage system that supports File.
2. Select Storage > File.
3. Select the NAS SERVERS tab.
4. Select the NETWORK tab.
5. Select the FILE INTERFACE tab.
6. Click Create to create a file interface. Alternatively, select an existing file interface and click Modify to modify the file interface properties.
7. Create: Type values for IP address, Subnet Mask/Prefix Length, Gateway, and VLAN ID. Select a value for Role.
8. Modify: Select a network device on the primary node and on the backup node. Modify values for IP address, Subnet Mask/Prefix Length, Gateway, and VLAN ID.
9. Click OK.