Before you create an SR, you need to configure the NFS storage. To be part of a pool, the NFS share must have a static IP address or be DNS-addressable. You must also configure the NFS server to have one or more target(s) that can be mounted by NFS clients (for example, XenServer hosts in a pool). The setup differs depending on your storage solution, so it is best to see your vendor documentation for details.
To create an SR on the NFS share at the pool level in XenCenter, follow these steps:
On the Resources pane, select the pool.
On the toolbar, click on the New Storage button. The New Storage Repository wizard opens.
Under Virtual disk storage, choose NFS VHD as the storage type. Choose Next to continue.
Enter a name for the new SR and the name of the share where it is located. Click on Scan to have the wizard scan for the existing NFS SRs in the specified location.