Serviceguard NFS Toolkit A.11.11.06, A.11.23.05 and A.11.31.08 Administrator's Guide (October 2011)

Figure 9 Server-to-Server Cross Mounting
The advantage of server-to-server cross-mounting is that every server has an identical view of the
file systems. The disadvantage is that, on the node where a file system is locally mounted, the file
system is accessed through an NFS mount, which has poorer performance than a local mount.
Each node NFS-mounts the file systems for both packages. If Node_A fails, Node_B mounts the
filesystem for Pkg_1, and the NFS mounts are not interrupted.
How the Control and Monitor Scripts Work
As with all Serviceguard packages, the control script starts and stops the NFS package and
determines how the package operates when it is available on a particular node. The 11i v1 and
11i v2 control script (hanfs.sh) contains three sets of code that operate depending on the
parameter — start, stop, or file_lock_migration — with which you call the script. On
11.0, there are two sets of code that you can call with the start or stop parameter.
Starting the NFS Services
When called with the start parameter, the control script does the following:
• Activates the volume group or volume groups associated with the package.
• Mounts each file system associated with the package.
18 Overview of Serviceguard NFS