Serviceguard NFS Toolkit A.11.31.08 Release Notes (5900-1483, March 2011)

Serviceguard NFS Toolkit Overview

HP Serviceguard Network File Server (NFS) Toolkit uses HP Serviceguard to set up highly available

NFS servers.

You must set up a Serviceguard cluster before you can set up Highly Available (HA) NFS.

Serviceguard NFS Toolkit is a separately purchased set of configuration files and control script,

which you can customize for your specific needs.

An NFS server is a host that exports its local directories and 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 HP Serviceguard NFS Toolkit, the NFS server package containing

the exported file systems can move to a different node in the cluster in the event of failure. After

Serviceguard starts the NFS package on the adoptive node, the NFS file systems are re-exported

from the adoptive node with minimum disruption of services to users. When the service returns,

the user can continue access to the file.

Announcement

Serviceguard NFS Toolkit A.11.31.08 supports both legacy and modular package configurations

with HP Serviceguard A.11.18 and later versions. The support for legacy and modular package

configurations is available for serviceguard clusters configured with both VxFS (non-CFS) and

Veritas Cluster File System (CFS). In a CFS environment, all nodes in the Serviceguard cluster can

concurrently access the files in the CFS. The NFS servers in the cluster can concurrently access and

export directories in the CFS. As a result, CFS enables NFS clients (typically located outside the

cluster) to concurrently use multiple NFS servers to access files. If an NFS server or a package fails,

the adoptive nodes do not have to mount disks from the failed system, since the disks are already

mounted on the adoptive node. This feature provides improved performance, scalability, and

availability.

Serviceguard NFS Toolkit A.11.31.08 contains defect fixes. For information about these defect

fixes, see “New Fixes in Version A.11.31.08” (page 5)

For more information about how to configure the NFS modular package in a VxFS (non-CFS)

environment, see the Serviceguard NFS Toolkit A.11.11.06, A.11.23.05 and A.11.31.08

Administrator's Guide. To access this document, go to the HP-UX Serviceguard manuals page at:

www.hp.com/go/hpux-serviceguard-docs

On this page, select HP Serviceguard NFS Toolkit.

For more information about how to configure the NFS modular package in a Veritas CFS

environment, see the Serviceguard NFS Toolkit Support for Cluster File System White Paper available

at the same location.

NOTE: Support for Serviceguard NFS Legacy Packages will be completely withdrawn in the

future. Use the modular method to create new packages whenever possible.

Limitations

Following are the limitations of using Serviceguard NFS Toolkit A.11.31.08 with Serviceguard

A.11.18 and later versions and CFS:

• Lock coherency for multiple NFS servers is not supported. NFS file lock coherency is not

supported when multiple NFS servers are concurrently accessing a file. Lock operations do

not return an error, but lock coherency is not guaranteed. This may cause data corruption or

cause an application to hang.

• Cross mounting using the nfs_xmnt script is not supported, since CFS provides file sharing

functionality within the cluster.

• Secure NFS is not supported when using Serviceguard with CFS.