Policy Pages Reference : Optimization Policy Settings : NFS
  
NFS
You can display and modify NFS optimization settings for the selected optimization policy on the Protocols NFS page.
NFS optimization provides latency optimization improvements for NFS operations by prefetching data, storing it on the client appliance for a short amount of time, and using it to respond to client requests. You enable NFS optimization in high-latency environments.
You can configure NFS settings globally for all servers and volumes or you can configure NFS settings that are specific to particular servers or volumes. When you configure NFS settings for a server, the settings are applied to all volumes on that server unless you override settings for specific volumes.
Important: NFS optimization is not supported in an out-of-path deployment.
NFS optimization is supported only for NFSv3. When a transaction using NFSv2 or v4 is optimized, the NFS latency module cannot be used and an alarm is triggered. Bandwidth optimization, SDR and LZ compression will still apply.
For detailed information about the NFS optimization, see the SteelHead Management Console User’s Guide for SteelHead CX.
Settings
Complete the configuration as described in this table.
Control
Description
Enable NFS Optimization
Enable this control on the client-side SteelHead to optimize NFS where NFS performance over the WAN is impacted by a high-latency environment. By default, this control is enabled.
These controls are ignored on server-side SteelHeads. When you enable NFS optimization on a server-side SteelHead, RiOS uploads the NFS configuration information for a connection from the client-side SteelHead to the server-side SteelHead when it establishes the connection.
NFS v2 and v4 Alarms
Enables an alarm when RiOS detects NFSv2 and NFSv4 traffic. When the alarm triggers, the SteelHead displays the Needs Attention health state. The alarm provides a link to this page and a button to reset the alarm.
Default Server Policy
Select one of these server policies for NFS servers:
•  Custom - Specifies a custom policy for the NFS server.
•  Global Read-Write - Specifies a policy that provides data consistency rather than performance. All of the data can be accessed from any client, including LAN-based NFS clients (which do not go through the SteelHeads) and clients using other file protocols such as CIFS. This option severely restricts the optimization that can be applied without introducing consistency problems. This is the default configuration.
•  Read-only - Specifies that the clients can read the data from the NFS server or volume but cannot make changes.
The default server policy is used to configure any connection to a server that does not have a policy.
Default Volume Policy
Select one of these volume policies for NFS volumes:
•  Custom - Specifies a custom policy for the NFS volume.
•  Global Read-Write - Specifies a policy that provides data consistency rather than performance. All of the data can be accessed from any client, including LAN-based NFS clients (which do not go through the SteelHeads) and clients using other file protocols such as CIFS. This option severely restricts the optimization that can be applied without introducing consistency problems. This is the default configuration.
•  Read-only - Specifies that the clients can read the data from the NFS server or volume but cannot make changes.
The default volume policy is used to configure a volume that does not have a policy.
Override NFS Protocol Settings
You can add server configurations to override your default settings. You can also modify or remove these configuration overrides. If you do not override settings for a server or volume, the appliance uses the global NFS settings.
Complete the configuration as described in this table.
Control
Description
Add a New NFS Server
Displays the controls to add an NFS server configuration.
Server Name
Specify the name of the server.
Server IP Addresses
Specify the IP addresses of the servers, separated by commas, and click Add.
If you have configured IP aliasing (multiple IP addresses) for an NFS server, you must specify all of the server IP addresses.
Add
Adds the configuration to the NFS Servers list.
Remove Selected
Select the check box next to the name and click Remove Selected.
Tip: To modify server properties, in the table row for the server, click the NFS Server Name to display controls you can use to modify server properties. Complete the configuration as above.