IBM AIX HACMP SG24-5131-00, Hardware User Manual

Page: 146 / 240

128
IBM Certification Study Guide AIX HACMP
• Ensure that node name and the service adapter label are the same on
each node in the cluster
or
• Alias the node name to the service adapter label in the /etc/hosts file.
5.4.5 Cross Mounted NFS File Systems and the Network Lock Manager
If an NFS client application uses the Network Lock Manager, there are
additional considerations to ensure a successful failover. Consider the
following scenario: Node A has a file system mounted locally and exported for
use by clients. Node B is an NFS client and mounts the exported file system
for local use by an application that issues lock requests using the
flock()
system call. Node A fails. Node B then attempts to unmount the NFS
mounted file system, mount it as a local file system, and export it for client
use. However, the unmount fails because of outstanding lock requests
against the file system.
Adding the following lines to the cl_deactivate_nfs script will clear
outstanding locks against the failed node and will allow the file system to be
unmounted. However, it will result in the loss of all locks. Consider your
configuration carefully. If you have non-cluster related NFS file systems
where losing locks would be unacceptable, you may need to take appropriate
steps before using this addition to the cl_deactivate_nfs script.
Add the code below between the following two lines (three places):