Assigning Physical Resources to Domains

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The Logical Domains Manager automatically selects the physical resources to be assigned to a domain. The Oracle VM Server for SPARC 3.2 software also enables expert administrators to explicitly choose the physical resources to assign to or remove from a domain.

Resources that you explicitly assign are called named resources. Resources that are automatically assigned are called anonymous resources.

Caution - Do not assign named resources unless you are an expert administrator.

You can explicitly assign physical resources to the control domain and to guest domains. Because the control domain remains active, the control domain might optionally be in a delayed reconfiguration before you make physical resource assignments. Or, a delayed reconfiguration is automatically triggered when you make physical assignments. See Managing Physical Resources on the Control Domain. For information about physical resource restrictions, see Restrictions for Managing Physical Resources on Domains.

You can explicitly assign the following physical resources to the control domain and to guest domains:

Physical CPUs. Assign the physical core IDs to the domain by setting the cid property.

The cid property should be used only by an administrator who is knowledgeable about the topology of the system to be configured. This advanced configuration feature enforces specific allocation rules and might affect the overall performance of the system.

You can set this property by running any of the following commands:
```
ldm add-core cid=core-ID[,core-ID[,...]] domain-name

ldm set-core cid=core-ID[,core-ID[,...]] domain-name

ldm rm-core [-f] cid=core-ID[,core-ID[,...]] domain-name
```
If you specify a core ID as the value of the cid property, core-ID is explicitly assigned to or removed from the domain.

Note - You cannot use the ldm add-core command to add named core resources to a domain that already uses anonymous core resources.
Physical memory. Assign a set of contiguous physical memory regions to a domain by setting the mblock property. Each physical memory region is specified as a physical memory start address and a size.

The mblock property should be used only by an administrator who is knowledgeable about the topology of the system to be configured. This advanced configuration feature enforces specific allocation rules and might affect the overall performance of the system.

You can set this property by running any of the following commands:
```
ldm add-mem mblock=PA-start:size[,PA-start:size[,...]] domain-name

ldm set-mem mblock=PA-start:size[,PA-start:size[,...]] domain-name

ldm rm-mem mblock=PA-start:size[,PA-start:size[,...]] domain-name
```
To assign a memory block to or remove it from a domain, set the mblock property. A valid value includes a physical memory starting address (PA-start) and a memory block size (size), separated by a colon (:).

Note - You cannot use dynamic reconfiguration (DR) to move memory or core resources between running domains when you set the mblock or cid property. To move resources between domains, ensure that the domains are in a bound or inactive state. For information about managing physical resources on the control domain, see Managing Physical Resources on the Control Domain.

Note - If you migrate a domain, any named resources that you assigned by using the cid and mblock properties are dropped. Instead, the domain uses anonymous resources on the target system.

You can use the ldm list-constraints command to view the resource constraints for domains. The physical-bindings constraint specifies which resource types have been physically assigned to a domain. When a domain is created, the physical-bindings constraint is unset until a physical resource is assigned to that domain.

The physical-bindings constraint is set to particular values in the following cases:

memory when the mblock property is specified
core when the cid property is specified
core,memory when both the cid and mblock properties are specified