Testing HA Data Services

This section provides suggestions about how to test a data service implementation in a highly-available environment. The test cases are suggestions and are not exhaustive. You need access to a test-bed Sun Cluster configuration so that the testing work does not affect production machines.

Test your HA data service on global-cluster non-voting nodes on a single Solaris host rather than on all Solaris hosts in the cluster. Once you determine that your data service works as expected in the global-cluster non-voting nodes, you can then test it on the entire cluster. Even if it's ill-behaved, a HA data service that runs in a global-cluster non-voting node on a host probably will not perturb the operation of data services that are running in other nodes or on other hosts.

Test that your HA data service behaves correctly in all cases where a resource group is moved between physical hosts. These cases include system crashes and the use of the clnode command. Test that client machines continue to get service after these events.

Test the idempotence of the methods. For example, replace each method temporarily with a short shell script that calls the original method two or more times.