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When to enable free space reallocation

Free space reallocation works best on workloads that perform a mixture of small random overwrites and sequential or random reads. You can expect additional CPU utilization when you enable free space reallocation. You should not enable free space reallocation if your storage system has sustained, high CPU utilization.

Note: You can use the sysstat command to monitor CPU utilization.

For best results, you should enable free space reallocation when you create a new aggregate. If you enable free space reallocation on an existing aggregate, there might be a period where Data ONTAP performs additional work to optimize free space. This additional work can temporarily impact system performance.