Application issues

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There are some key points to remember when planning and maintaining applications.

These points include:

  • Application maintenance will require downtime for resource groups if binaries reside on a shared disk.
  • Upgrades should be tested prior to implementation to anticipate effects on the production cluster.
  • Changes to application start and stop procedures should be thoroughly tested prior to going into production.
  • Do not have shared applications already running when you start the cluster. A second attempt at starting already running applications may cause a problem.
  • Do not manually execute the application stop script for any reason on a running cluster without starting the application back up again. Problems may occur if an attempt is made to stop the application that is already down. This could potentially cause a fallover attempt to be unsuccessful.