In this example scenario, for the number of clusters that are used in this system, assume that you decided to create two two-node clusters for the zones on the Database Domains.
If you have 64 TB of usable disk capacity, and you want to create two clusters for the zones, you could use the existing 64 TB of space in one of several ways:
Use the entire 64 TB of existing space for the two clusters in one of these ways:
Create two equal-sized clusters, where the total amount of space used by the disk groups in each cluster would be 32 TB.
Create two clusters of different sizes, where the total disk space used by the disk groups for the two clusters equals 64 TB. For example, one cluster with the total disk space used by the disk groups equaling 12 TB and the other cluster with the total disk space used by the disk groups equaling 52 TB.
Keep in mind that by using the entire 64 TB of existing space for the two clusters in this example scenario, you leave yourself no room for future expansion, either for adding zones and clusters to the system or for expanding the amount of space available to the existing clusters.
Use a portion of the existing 64 TB of usable space for the two clusters that you will be creating, while reserving some of the usable space for future expansion.
This example scenario creates two equal-sized clusters, so when allotting disk sizes to each disk group within each cluster, verify that the total amount of space used by all three disk groups does not exceed 32 TB for each cluster.