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2-8 instant Capacity on Demand Notes for Installation and Use

start a replacement CPU each time the system is booted until the faulty CPU is

replaced.

5.3 Partitioning

You must reinstall the iCAP software after a system is repartitioned. If a iCAP

system is to be partitioned, uninstall the iCAP software, partition the system,

and then reinstall the iCAP software on all of the new partitions. It is up to the

person who partitions the system to ensure that only the CPUs that have been

purchased are used within the partitions. Once the iCAP software has been

uninstalled, you must delete the iCAP data file

(SYS$SYSTEM:iCAP$DATA.DAT) so that your environment will be correctly

configured.

For more information about partitioning, refer to the OpenVMS Alpha

Partitioning and Galaxy Guide.

5.4 Accidental iCAP CPU Activation

If someone accidentally activates a iCAP CPU, you can modify the number of

iCAP CPUs back to the original number by using the following command:

$ @SYS$SYSTEM:iCAP$SYSTEM MODIFY

This command should be used only to rectify accidental activations. If you wish

to START or STOP a CPU, use the DCL commands

START/CPU [n] or STOP/CPU [n]

6.0 Platform Caveats

6.1 GS80, GS160 and GS320

On a traditional symmetrical multiprocessor (SMP) system such as the

GS140E, all CPUs are numbered sequentially and access time to system

memory from any CPU is equivalent. Therefore, it does not matter in which

order CPUs are put online. When you enter a START/CPU command without

specifying a specific CPU, the first inactive CPU that is encountered is started

up.

However, on NUMA architecture systems, you must consider the NUMA

hardware characteristics and your Quad Building Block (QBB) and CPU

configuration before starting a new CPU. Memory access speeds can vary

depending on whether the memory being accessed resides on the same QBB as

the new CPU. There must be at least one CPU online in each QBB to handle

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HP ES80 Installationshandbuch Seite 26