What disk space threshold should trigger an incident?

The appropriate threshold that should trigger an incident is when there is less than 20% disk space available. This level serves as a proactive measure to ensure that systems continue to operate smoothly without encountering issues related to insufficient disk space. When disk usage reaches such a threshold, it indicates that resources are being depleted and could lead to performance degradation or interruptions.

Establishing a threshold of 20% available disk space allows ample opportunity for users or administrators to address storage concerns. It provides enough time for necessary actions such as archiving, data cleanup, or scaling storage infrastructure before problems arise. Typically, organizations aim to avoid reaching critically low disk space levels, as this can impact not only performance but also the ability to handle additional data securely.

The other options suggest thresholds that may be too lenient or could risk operational issues. For instance, a threshold of less than 10%, 15%, or even 5% might not leave sufficient time to react and could lead to potential failures in the system if additional data needs to be handled or if the environment encounters unexpected loads. Thus, having a trigger at less than 20% available space is a balanced approach to maintaining system integrity and functionality.