Cod cpu allocation – FUJITSU M Server M5000 User Manual
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SPARC Enterprise Mx000 Servers Capacity on Demand (COD) User’s Guide • January 2012
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