HP P9000 for Compatible FlashCopy Mirroring User Guide (AV400-96388, October 2011)

And Σ(γ) stands for the total number of relationships.
The following figure shows when seven relationships are created with 3390-3 volumes, and three
relationships are created with 3390-L volumes (32,769 CYL).
Figure 23 Referential example for calculating the number of relationships
As shown in the figure, the total number of resources used per pair is calculated as:
Resources used for A through I = (9 + 3) + 3 + 3 + 3 + 3 + 3 + (25 x 3) + 25 + 25 = 152.
The conditions for the number of relationships you can create are:
Σ(α) ≤ (β) and Σ(γ) ≤ 1,048,575
In the case of the example shown in the figure, Σ(α) ≤ (β) is:
• 54 ≤ 26,176 or 104,768, or 209,600.
While Σ(γ) ≤ 1,048,575 is:
• 10 ≤ 1,048,575.
Since the example shown in the figure meets the conditions shown above, you can establish all
the relationships in the figure.
Selecting Prior operation
You can use the options in the following table for Compatible FlashCopy operations. The available
option types depend on the storage system settings.
34 Preparing for Compatible FlashCopy operations