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.  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). Definitions in HCD Figure I-2 Software updates with sample values on z/OS SCRATCH SCRATCH Category: SCRATCH Category: Draft Document for Review February 7, 2020 3:15 pm 8464axStats.fm Table I-1 HCD definitions Host Cluster CTLUNIT definition LIBPORT-ID PROD Cluster 0 CUADD 00-0D  (1000 - 10DF) 01-0E Cluster 1 CUADD 40-4D (2000 - 20DF) 41-4E TEST Cluster 0 CUADD 0E-0F (10E0 - 10FF) 0F-10 Cluster 1 CUADD 4E-4F (20E0 - 20FF) 4F-50 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. Appendix I. Case study for logical partitioning of a two-cluster grid  923