Planning for AFM gateway nodes

An AFM cache cluster must include minimum one node running the Linux operating system. This node can be assigned the gateway nodes role for the AFM cache filesets. Every AFM fileset is assigned to a unique AFM gateway, which is called as a primary gateway. This gateway handles all the communication between the AFM fileset and the target on the home site for synchronization.

You can assign and remove a gateway node role by using the following commands:

To assign gateway node role to the cluster member node, issue the following command:
```
mmchnode -N node1,node2,... --gateway
```
To remove the gateway node role from the cluster member node, issue the following command:
```
mmchnode -N node1,node2,... --nogateway
```
The AFM gateway node is licensed as a server node.

Multiple gateway nodes

An IBM Storage Scale cluster can have one or more gateway nodes. Multiple gateway nodes are helpful if you want to assign different filesets to a different gateway node and configure parallel data transfer. The assignment of the gateway node to the AFM cache fileset is based on the Hashing Algorithm. You can also assign a gateway node to an AFM cache fileset.

For more information about Parallel Data Transfer, see Parallel data transfers.

AFM is enabled with IBM Storage Scale Data Access Edition.

For more information about the licensing, see IBM Storage Scale product editions.