content_image/984351.jpg content_image/984355.jpg
Figure I-2 shows the z/OS updates that are needed in the case study that define specific volume ranges, several device addresses, and scratch categories. 

## Definitions in HCD 

<img src='content_image/984351.jpg'>

In HCD, you define the devices that are needed for each of the hosts and connect them to the LPARS. This case study defines 28 out of 32 CUs for PROD (2 x 224 logical devices) and 4 out of 32 CUs (2 x 32 logical devices) for TEST. The devices for Cluster 0 features addresses 1000 - 10FF and for Cluster 1, 2000 - 20FF (see Table I-1). 

<img src='content_image/984355.jpg'>

More definitions are needed. Consider the following points: 

GLYPH<SM590000> The devices must be connected to processors. 

GLYPH<SM590000> Devices must be related to esoterics definitions. 

GLYPH<SM590000> Definitions regarding the FICON infrastructure and FICON directors are not included. 

Normally, you can activate the new definitions dynamically. For more information about HCD definitions, see 6.2, “Hardware conf iguration definition” on page 233. 

