10.1.4 Planning the data configuration
When you use Performance Management on a logical host, you need to consider the data requirements for the shared disk, over and above the data requirements for Performance Management in a non-cluster system.
Each cluster system has a shared disk that is shared between the executing node and standby node when a failover occurs. In addition, each executing node and standby node has local disk that are specific to each physical host and cannot be taken over by a different node.
With Performance Management, when a logical host environment is set up, an environment directory is created on the shared disk. This environment directory stores the definition files and operation monitoring data required for switching nodes when a failover occurs. The execution files and commands required to run Performance Management are stored on local disks.
The following figure shows the data configuration for Performance Management when used on a logical host.
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![[Figure]](GRAPHICS/ZU115070.GIF)
- Supplemental information:
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Some definition information and log files are located on local disks.
For details on the formula used to calculate the disk capacity required for logical host operation with Performance Management, see the sections that describe the exclusively occupied disk space when running on a cluster system in an appendix of the JP1/Performance Management Planning and Configuration Guide.