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:
Oracle SuperCluster M7 with a single compute node, with Exadata Storage Servers with High Capacity disks.
The single compute node with two PDomains, or an R1 PDomain configuration.
Four CMIOUs in each PDomain, or an R1-4 PDomain configuration.
The U4-4 LDom configuration (4 LDoms) will be set up on both PDomains in Oracle SuperCluster M7.
The following LDom types will be assigned to each LDom in both PDomains:
LDom 1: Database Domain with 4 zones
LDom 2: Database Domain (without zones)
LDom 3: Solaris 11 Application Domain
LDom 4: Root Domain
5 RAC instances set up on the Oracle SuperCluster M7:
One RAC instance for each zone on the Database Domains with zones (4 RAC instances total for the zones)
One RAC instance for the two Database Domains (without zones)
For the purposes of this exercise, assume the following:
Four zones will be set up on LDom 1 (the first Database Domain) in both PDomains.
No zones will be set up on LDom 2 (the second Database Domain) in both PDomains.
Based on the U4-4 LDom configuration (refer to https://docs.oracle.com/cd/E58626_01/html/E58633/cgffeihd.html#scrolltoc) and Cores Available for Domains and Zones, you can determine that 32 cores are allocated to both Database Domains on each PDomain.
The following sections describe how cores could be allocated in both of these Database Domains in both PDomains:
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 PDomain will contain four zones, and it has 32 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 8 cores (32 / 4 = 8).
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 has one CMIOU associated with it, which means that two cores will be set aside for the global zone, so you actually have 30 cores available for the four zones in this Database Domain. So, for the zones in this Database Domain, you could allocate 8 cores for two of the zones (16 cores) and 7 cores for the other two zones (14 cores).
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 PDomains.