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60 Logical Partitions on System i5

5. Click OK. See Figure 3-19.

Figure 3-19 Accept shutdown

The HMC will now shut down.

Next we discuss the basic functions and terminology of the HMC.

3.5 Server and partition

If an ^ i5 is to be partitioned, then an HMC is needed to create and manage the

partitions. The partition configurations are implemented using profiles that are created on the

HMC and that are stored on the HMC and on the service processor. A profile defines a

configuration setup for a managed system or partition. The HMC allows you to create multiple

profiles for each managed system or partition. You can then use the profiles you have created

to start a managed system or partition with a particular configuration. There are two types of

profiles, a partition profile and a system profile.

Partition profiles

A partition does not actually own any resources until it is activated. The resources that are

specified for the partition are stored in the partition profile. One partition can have multiple

profiles, and which partition profile is activated depends on what resources the partition will

use. Only one partition profile can be active at a time for a partition.

For example, one partition profile may be configured to use 3 processors, 6 gigabytes of

memory, and I/O slots 6, 7, 11, and 12 on a particular bus. At another time you may want to

activate this same partition using 1 processor, 2 gigabytes of memory, and the same I/O

slots. This will obviously have an impact on the total system resources, so careful planning

and a clear understanding of the total system resources are required.

An example of multiple partitions needing to share the same slots might be a shared tape

drive IOA and IOP.

Partition profiles are not affected when you use the dynamic logical partitioning feature to

move resources from one partition to another. This means if you dynamically move a

processor or some memory into a partition, then the partition profile will not be updated to

reflect that change, and the next time the partition is powered off/on, it will revert back to the

configuration as it was created in the partition profile. Any I/O resources that are dynamically

moved out of a partition to another one, will stay with that partition even if the original owning

partition is powered off and back on. The partition will not try to take back the I/O resource

during the power off and power on in this partition, if it has already been allocated to another

partition.

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