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Capacity on Demand (COD) Administration 5
When the domains are first powered on, four COD permits are assigned to COD
CPUs in domain 0 and two to domain 1. The remaining four COD permits are
available on a first-come, first-served basis to all four domains (0, 1, 2, and 3).
Notes on Domain Configuration
Note the following points when you configure domains using resources on COD
boards.
■ To set the COD board to Uni-XSB
When 3 COD permits or less are allocated to a COD board, there are CPUs which
can't be used in Uni-XSB.
To use these CPUs, you need to purchase the COD permits, and then perform
either of the following operations:
■ Power off the domain which contains the relevant Uni-XSB and power it on
again.
You can't add the CPU by rebooting the domain.
■ Use DR to once detach the relevant Uni-XSB from the domain and then
remount it to the domain.
For details on DR, see the SPARC Enterprise M4000/M5000/M8000/M9000
Servers Dynamic Reconfiguration (DR) User’s Guide.
Note – Although the domain reboot occurred due to the reasons such as CPU
failure, the server doesn't automatically start to use the unused CPU instead of the
failed CPU.
■ To set the COD board to Quad-XSB
Since the CMU is divided into four, you can use the resource on 1 Quad-XSB per
COD permit. You can't use the remaining resources on 3 Quad-XSBs.
Headroom Management
Headroom is the capability to use up to four COD CPUs per server without a
sufficient number of COD permits to cover their use. Headroom allows you to
activate a COD board under these conditions:
■ As a hot spare to replace a failed system board
■ When you intend to purchase the appropriate number of COD permits, but need
to use the resources immediately