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Installation and Use with the OpenVMS Operating System 2-9

any I/O interrupts associated with peripherals connected to the QBB's PCI

drawers.

The iCAP recommendation for AlphaServer GS80, GS160, and GS320 systems

is to start with at least one online CPU per QBB, and then add CPUs one by one

to distribute them evenly across the QBBs. To do this, you can specify which

CPU to start in the START/CPU command. For example, the following

command specifies that CPU 8 be started:

$ START/CPU 8

For more information about managing QBBs and partitions, refer to the

OpenVMS Alpha Partitioning and Galaxy Guide.

6.2 ES47, ES80 and GS1280

For ES47, ES80 and GS1280, an inactive iCAP CPU cannot be connected to

either internal I/O (ES47 & ES80) or an external I/O Building Block Drawer.

1. ES47 & ES80: One CPU on the iCAP Dual CPU Building Block Module

must remain active, and the active CPU must be the one connected to the

internal I/O. The inactive iCAP CPU cannot be connected to an external I/O

Building Block Drawer.

2. GS1280: Neither CPU on the iCAP Dual CPU Building Block Module can be

connected to an external I/O Building Block Drawer.

The ES47, ES80 and GS1280 have a mesh-based Non-Uniform Memory Access

(NUMA) architecture. A mesh is a grid of CPUs where the CPU on one side of

the grid is connected to another CPU on the far side of the grid. When a CPU

on these platforms needs to access remote memory or I/O resources local to a

different CPU, the traffic is routed through the mesh to the other CPU. This

complicates the choice of which CPU to put on line as memory access speeds can

vary depending on the number of hops from one CPU to another. CPUs should

be placed online so that the online CPUs are next to one another in the mesh,

and form as square a region as possible.

7.0 Removing iCAP

After you have activated and purchased all the iCAP CPUs, you can remove the

iCAP functionality from the system using the following command:

$ PRODUCT REMOVE iCAP

The SYSTEM account receives mail when the iCAP functionality is removed.

Removal is optional.

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HP ES80 Installationshandbuch Seite 27