Red Hat Knowledgebase

To create highly available NFS services, there are a few requirements which must be met by each cluster member. (Note: these requirements do not pertain to NFS client systems.) These requirements are as follows:

• The NFS daemon must be running on all cluster servers. Check the status of the servers by running the following:

  /sbin/service nfs status

  NFS services will not start unless the following NFS daemons are running: nfsd, rpc.mountd, and rpc.statd. If the service is not running, start it with the following commands:

  /sbin/service portmap start
  /sbin/service nfs start

  To make NFS start upon reboot and when changing runlevels, run the following command:

  /sbin/chkconfig --level 345 nfs on

• The RPC portmap daemon must also be enabled with the following command:

  /sbin/chkconfig --level 345 portmap on

• File system mounts and their associated exports for clustered NFS services should not be included in /etc/fstab or /etc/exports. Rather, for clustered NFS services, the parameters describing mounts and exports are entered via the Cluster Configuration Tool. For your convenience, the tool provides a Bulk Load NFS feature to import entries from an existing file into the cluster configuration file.
• NFS cannot be configured to run over TCP with Red Hat Cluster Manager. For proper failover capabilities, NFS must run over the default UDP.