Highly Available NFS

The SAP R/3 system requires the Network File System (NFS) to be highly available. Otherwise the NFS is one of the four single points of failure (SPOF) in the SAP R/3 environment. SGeSAP works with HP's Highly Available NFS product, the NFS Toolkit (B5140BA). Refer to the MC/ServiceGuard NFS Toolkit Versions A.11.00.04 and A.11.11.01 Release Notes.

The design of the HA-NFS toolkit has changed with the introduction of MC/ServiceGuard 11.13. See the MC/ServiceGuard Version A.11.13 Release Notes. With this MC/ServiceGuard version a new control script support for additional products was introduced. The package control script template now provides special code for use with additional products, including MetroCluster with Continuous Access/CA, MetroCluster with EMC SRDF, and the HA-NFS toolkit. Refer to the additional product's documentation for details about how to create a package using the hooks that are provided in the control script template.

The HA-NFS product is a separate product with a set of configuration and control files that must be customized for the SGeSAP environment. SGeSAP uses the NFS-Toolkit interface to make the NFS server in an SAP R/3 environment highly available. The detailed description of how to set up SGeSAP is now based on the new HA-NFS concept. This means that all installation steps in Chapter 2 of this document are based on the configuration setup for SGeSAP with MC/ServiceGuard Version 11.13 and HA-NFS toolkit 1.1 for 11.x.