10.2.5 Sun Cluster HA for NFS Considerations

If you have application servers outside the cluster, you must configure Sun Cluster HA for NFS on the central instance logical host. Application servers outside the cluster must NFS-mount the SAP profile directories and executable directories from the SAP central instance. See Chapter 11, Setting Up and Administering Sun Cluster HA for NFS, for detailed procedures on setting up Sun Cluster HA for NFS, and note the following SAP-specific guidelines:

• Do not configure any node to be an NFS client of another node within the same cluster.

• If you will run application servers within the cluster, you must set up an external cluster running NFS. The application servers and central instance will mount files from this NFS cluster.

• There are start order dependencies among Sun Cluster HA for NFS, HA-DBMS, and Sun Cluster HA for SAP data services. You can use special scripts to manage these dependencies. See "10.7 Setting Data Service Dependencies for SAP", for more information.

• Usually, you should share the following directories to all SAP instances:

  • /usr/sap/trans

  • /sapmnt/<SAPSID>/exe

  • /sapmnt/<SAPSID>/global

  • /sapmnt/<SAPSID>/profile