Introduction to troubleshooting

The first approach to troubleshooting is to use the techniques for monitoring the grid. As described in chapter "Monitoring the Grid", you typically view log files and change log levels in order to gain more information. When this is not enough, you can consider the state of the hosts (machines) and anything related to the operating system on them. Are they configured optimally and do they have enough resources at hand. For example, are the disks full? Do you need more memory? Are the CPUs stressed? Are there network issues?