Because the number of processor modules in each SPARC T5-8 server varies, depending on whether you have a Half Rack or Full Rack, the number of cores available for each SPARC T5-8 server in your Oracle SuperCluster T5-8 also varies:
For the Half Rack, each SPARC T5-8 server contains two processor modules. There are two sockets or PCIe root complex pairs on each processor module. Sixteen cores are associated with each socket, for a total of 64 cores (four sockets or PCIe root complex pairs) for each SPARC T5-8 server in the Half Rack.
For the Full Rack, each SPARC T5-8 server contains four processor modules. There are two sockets or PCIe root complex pairs on each processor module. Sixteen cores are associated with each socket, for a total of 128 cores (eight sockets or PCIe root complex pairs) for each SPARC T5-8 server in the Full Rack.
When you first install the operating system instances on a domain, that domain is automatically designated as the global zone. When creating zones on Database Domains, the Database Domain is designated as the global zone, and the zones created on that Database Domain are designated as nonglobal zones.
A certain number of cores are always set aside for the global zone (the Database Domain), and the remaining cores in the Database Domain are available for the nonglobal zones (the zones in the Database Domain). The number of cores that are set aside for the global zone varies, depending on the size of the domain.
The following table provides information on the number of cores that are available for specific domains and zones that are created within those domains. See Understanding Domain Configurations for more information on the different types of domains.
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When using the information in the table, keep in mind that the number of cores that are set aside for the global zone applies only when you are creating zones (nonglobal zones) on that Database Domain. In that case, a certain number of cores are reserved for the Database Domain (the global zone) and the remaining cores are available for the zones on that Database Domain (the nonglobal zones). If you have a Database Domain with no zones, then all the cores are available for that Database Domain.
For each zone that you create, use a minimum of one core per zone. However, depending on the workload that you expect on a zone, a larger number of cores per zone might be preferable, thereby reducing the total number of zones on each SPARC T5-8 server. Carefully consider the expected workload on each zone that you create, so that you allot the appropriate number of cores to those zones.