How to calculate the overhead of storage pool based on the desired capacity when deploy a new ONTAP Select cluster or add capacity to an existed cluster

When deploy a new ONTAP Select cluster, you must to specify a proper storage pool capacity limit so that you can safely deploy and use the cluster.
The way to calculate overhead of the storage pool is different when creating a new select cluster or add capacity to an existed cluster.
When calculating the required minimum storage pool capacity, the following considerations need to be taken into account:
- Capacity desired for the ONTAP Select nodes to be used.
- Overhead reserved for ONTAP Select system backend operations: 130 GB - 272 GB per node
- A 2% buffer is reserved for the total storage pool.

Notes:

A 2% buffer is left unused in each storage pool, which is only used for available capacity check.
ONTAP Select virtual machines created on storage pools are attempted using thin-provisioning but are subject to underlying storage policies.
If honored, ONTAP Select will not immediately consume the full amount of the storage specified.
If ONTAP Select attempts to use storage that has been allocated to it and if enough storage is not available, a data-serving outage will occur.