High activity or high churn file systems are defined as file systems that have a high rate of data being accessed, deleted and created. Due to the workload type and to maintain a high level of write performance, sufficient free space is required. These amounts can vary based on file system size. The following recommendations take into account file system size.
- File system size range < 1 TiB
- Recommendation: The file system should be maintained at a usage level no higher than 80%. The Entire File System usage thresholds are recommended to be set at the following levels:
| Warning | User Definable* |
| Severe | 80% |
* User Definable: Choose a value that provides sufficient time to increase file system capacity.
- File system size range 1 TiB < 10 TiB
- Recommendation: The file system should be maintained at a usage level no higher than 85%. The Entire File System usage thresholds are recommended to be set at the following levels:
| Warning | 70% |
| Severe | 85% |
- File System size range > 10 TiB
- Recommendation: The file system should be maintained at a usage level no higher than 90%. The Entire File System usage thresholds are recommended to be set at the following levels:
| Warning | 80% |
| Severe | 90% |