HP Hitachi ShadowImage for Mainframe User Guide (T5213-96032, November 2011)

Figure 20 Total Capacity of SIz Volumes (Example 1)
In Figure 20 (page 41), the total capacity of the SIz volume is 1.
Figure 21 (page 41) shows two SIz pairs.
Figure 21 Total Capacity of SIz Volumes (Example 2)
In Figure 21 (page 41), the total capacity of the SIz volumes is 3.
Requirements for Other Software
You may use the following program products for SIz operations.
• XP for Business Continuity Manager Software™
• IBM PPRC host software: TSO PPRC and ICKDSF PPRCOPY commands
For information about the requirements of using these program products on ShadowImage for
Mainframe, see the appropriate supporting documents.
Assessing ShadowImage for Mainframe Requirements
This section describes the assessments about SIz operations, such as how many pairs you are
going to create or how to decide the settings like copy pace and paths.
Calculating Maximum Number of Pairs
When you create SIz pairs, resources called differential tables and pair tables will be required.
The number of available differential tables and pair tables in one storage system depends on
whether the additional shared memory is installed or not. There are several patterns of additional
shared memory for differential tables and pair tables, and you can choose any pattern you like.
Table 14 (page 42) describes the pattern of additional shared memory.
Assessing ShadowImage for Mainframe Requirements 41