Understanding the Software Configurations
Note - Even though a domain with two IB HCAs is valid for a Root Domain, domains with
only one IB HCA should be used as Root Domains. When a Root Domain has a single IB
HCA, fewer I/O Domains have dependencies on the I/O devices provided by that Root Domain.
Flexibility around high availability also increases with Root Domains with one IB HCA.
The following domains have only one or two IB HCAs associated with them and can therefore
be used as a Root Domain:
■
Small Domains (one IB HCA)
■
Medium Domains (two IB HCAs)
In addition, the first domain in the system (the Control Domain) will always be a dedicated
domain. The Control Domain cannot be a Root Domain. Therefore, you cannot have all of the
domains on your server as Root Domains, but you can have a mixture of Root Domains and
dedicated domains on your server or all of the domains as dedicated domains.
A certain amount of CPU core and memory is always reserved for each Root Domain,
depending on which domain is being used as a Root Domain in the domain configuration and
the number of IB HCAs and 10GbE NICs that are associated with that Root Domain:
■
The last domain in a domain configuration:
■
Two cores and 32 GB of memory reserved for a Root Domain with one IB HCA and
10GbE NIC
■
Four cores and 64 GB of memory reserved for a Root Domain with two IB HCAs and
10GbE NICs
■
Any other domain in a domain configuration:
■
One core and 16 GB of memory reserved for a Root Domain with one IB HCA and
10GbE NIC
■
Two cores and 32 GB of memory reserved for a Root Domain with two IB HCAs and
10GbE NICs
Note - The amount of CPU core and memory reserved for Root Domains is sufficient to support
only the PFs in each Root Domain. There is insufficient CPU core or memory resources to
support zones or applications in Root Domains, so zones and applications are supported only in
the I/O Domains.
The remaining CPU core and memory resources associated with each Root Domain are parked
in CPU and memory repositories, as shown in the following graphic.
Understanding the System 49
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