HP Serviceguard Toolkit for NFS manual Overview of MC/ServiceGuard NFS

Overview of MC/ServiceGuard NFS

MC/ServiceGuard NFS is a tool kit that enables you to use

MC/ServiceGuard to set up highly available NFS servers.

You must set up an MC/ServiceGuard cluster before you can set up Highly Available NFS. For instructions on setting up an MC/ServiceGuard cluster, see the Managing MC/ServiceGuard manual.

MC/ServiceGuard NFS is a separately purchased set of configuration files and control scripts, which you customize for your specific needs. These files, once installed, are located in /opt/cmcluster/nfs.

MC/ServiceGuard allows you to create high availability clusters of HP 9000 Series 800 computers. A high availability computer system allows applications to continue in spite of a hardware or software failure.

MC/ServiceGuard systems protect users from software failures as well as from failure of a system processing unit (SPU) or local area network (LAN) component. In the event that one component fails, the redundant component takes over, and MC/ServiceGuard coordinates the transfer between components.

An NFS server is a host that “exports” its local directories (makes them available for client hosts to mount using NFS). On the NFS client, these mounted directories look to users like part of the client’s local file system.

With MC/ServiceGuard NFS, the NFS server package containing the exported file systems can move to a different node in the cluster in the event of failure. After MC/ServiceGuard starts the NFS package on the adoptive node, the NFS file systems are re-exported from the adoptive node with minimum disruption of service to users. The client side hangs until the NFS server package comes up on the adoptive node. When the service returns, the user can continue access to the file. You do not need to restart the client.

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