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COD CPU Allocation

COD CPUs are activated either when a domain with a COD board is powered on or

when a new COD board is installed and powered on. The XSCF firmware activates

COD CPUs automatically on a first-come, first-served basis. However, you can

reserve one or more COD permits for a particular domain.

At board power on, the Service Processor determines which COD CPUs are in

working order and requests COD permits for them. The XSCF firmware checks the

COD database and current usage, determines which boards are COD boards, and

allocates COD permits to their COD resources. It then tells the Service

Processor which COD CPUs to configure into the domain.

The Service Processor configures only those COD resources that are activated.

COD CPUs that are not activated are assigned COD-disabled status. A COD CPU

might be assigned COD-disabled status if it cannot be activated because all COD

permits are in use.

When you remove a COD board from a domain through a reconfiguration operation,

when a domain containing a COD board is shut down normally, or when the Service

Processor detects a fault and unconfigures a board from the domain, your COD

permits for the resources on those boards are released and added to the pool of

available COD permits and can be used to put other COD CPUs in your server into

use.

Allocation of COD permits does not change during a Service Processor reset or

failover.

You can reserve COD permits for specific domains by using the setcod(8)

command. After power on, permits are first allocated to COD CPUs in domains with

reserved permits, then remaining COD permits are allocated on a first-come, first-

served basis to the remaining resources. When a domain is powered off, the reverse

happens: First the unreserved COD permits are released, then the reserved COD

permits are released.

For example, assume your server has 10 COD permits and you reserved them for

these domains

PROC Permits reserved for domain 0: 4

PROC Permits reserved for domain 1: 2

PROC Permits reserved for domain 2: 0

PROC Permits reserved for domain 3: 0

SPARC Enterprise Mx000 Servers Capacity on Demand (COD) User's Guide • January 2012