Managing Serviceguard NFS for Linux, September 2006

Installing and Configuring Serviceguard NFS for Linux

Before Creating an Serviceguard NFS Package

Chapter 2 23

3. Configure the disk hardware for high availability. Disks may be

protected using disk mirroring or an HP High Availability Disk

Array. Data disks associated with Serviceguard NFS must be

external disks. All the nodes that support the Serviceguard NFS

package must have access to the external disks. For most disks, this

means that the disks must be attached to a shared bus that is

connected to all nodes that support the package.

Create appropriate multiple device (MD) definitions for your storage.

For information on configuring multiple devices, see the Managing

Serviceguard for Linux, Chapter 5.

4. Use LVM commands to set up volume groups, logical volumes, and

file systems as needed for the data that will be exported to clients.

Refer to the Managing Serviceguard manual.

a. Create a directory for each NFS package. For example:

/usr/local/cmcluster/nfs1

b. In the directory create a raidtab.nfs1 file describing this

package’s MD definitions.

The names of the volume groups must be unique within the cluster,

and the major and minor numbers associated with the volume

groups must be the same on all nodes. In addition, the mounting

points and exported file system names must be the same on all

nodes.

The preceding requirements exist because NFS uses the major

number, minor number, inode number, and exported directory as

part of a file handle to uniquely identify each NFS file. If differences

exist between the primary and adoptive nodes, the client’s file handle

would no longer point to the correct file location after movement of

the package to a different node.

5. Make sure the user IDs and group IDs of those who access the

Serviceguard NFS file system are the same on all nodes that can run

the package.

Make sure the user IDs and group IDs in the /etc/passwd and

/etc/group files are the same on the primary node and all adoptive

nodes, or use NIS to manage the passwd and group databases.