To better understand the number of cores that would be available for zones on certain types of Database Domains, consider the example configuration as described in Example Configuration, where:
The system is the Full Rack version of the Oracle SuperCluster T5-8
The F4-2 LDom configuration (four LDoms) is set up on both SPARC T5-8 servers in the Oracle SuperCluster T5-8 (see Full Rack Domain Configurations for more information on this specific type of LDom configuration)
The following LDom types are assigned to each LDom in both SPARC T5-8 servers:
LDom 1: Database Domain
LDom 2: Solaris 10 Application Domain
LDom 3: Solaris 11 Application Domain
LDom 4: Database Domain
For the purposes of this exercise, assume the following:
Four zones will be set up on LDom 1 (the first Database Domain) in both SPARC T5-8 servers.
No zones will be set up on LDom 4 (the second Database Domain) in both SPARC T5-8 servers.
Using the information provided in Full Rack Domain Configurations and Cores Available for Domains and Zones, you can determine the following information about the two Database Domains on each SPARC T5-8 server in this Full Rack:
LDom 1 (the first Database Domain) has the following characteristics:
This domain is a Large Domain.
64 cores are available for this domain.
LDom 4 (the second Database Domain) has the following characteristics:
This domain is a Medium Domain.
32 cores are available for this domain.
The following sections describe how cores could be allocated in both of these Database Domains in both SPARC T5-8 servers:
This Database Domain will contain four zones, which means that:
The Database Domain will be the global zone.
The four zones within the Database Domain will be nonglobal zones.
Because this Database Domain on each SPARC T5-8 server will contain four zones, and it has 64 cores available to it, it would appear at first that you could create four equal-sized zones with regards to the number of cores, where each zone would have 16 cores (64 / 4 = 16).
However, based on the information provided in Cores Available for Domains and Zones, a certain number of cores will be set aside for the global zone. This domain is a Large Domain, which means that four cores will be set aside for the global zone, so you actually have 60 cores available for the four zones in this Database Domain. So, for the zones in this Database Domain, you could allocate 15 cores for each of the four zones to use all 60 cores available for zones in this Database Domain (60 / 4 = 15).
This Database Domain has 32 cores available to it, but this Database Domain will not contain any zones. The Database Domain is still considered the global zone in this situation, but because there are no zones in this domain, all 32 cores are available for this Database Domain, so you could allocate all 32 cores to this Database Domain on both SPARC T5-8 servers.