| 32,760 |
|
|
| 1,770 |
|
|
| 885 |
|
|
| 2,655 |
|
|
•The number of the required bitmap areas:
The number of bitmap areas to be used by all data volumes that form pairs is calculated out of the number of cylinders. The calculated number of bitmap areas is referred to as "the required number of bitmap areas" in the following formula. Use the following formula to calculate the required number of bitmap areas for a data volume. The ↑…↑ symbols enclosing a value indicate that the enclosed value should be rounded up to the nearest integer.
The required number of bitmap areas = (↑((number of cylinders ⋅ 15) ⎟ 122,752) ↑)
–” number of cylinders ⋅ 15” indicates the number of slots
–122,752 is the number of slots that a bitmap area can manage
Note: If the calculated required number of bitmap areas exceeds the total number of bitmap areas in the storage system, the number of pairs that can be created will be limited.
•The maximum number of pairs that can be created:
The maximum possible number of pairs that can be created depends on the number of bitmap areas of the storage system and the required number of bitmap areas required to create pairs.
The number of bitmap areas of the storage system depends on the capacity of shared memory. The relationship between the area number of shared memory and the number of bitmap areas in the storage system is described in Table 3.7.
Table
Additional Shared Memory for URz
Total Number of Bitmap Areas of Storage System
No additional shared memory for URz | 0 |
|
|
Additional shared memory for URz is installed | 7,424 |
|
|
Extension 1 | 16,384 |
|
|
Extension 2 | 32,768 |
|
|
Extension 3 | 44,256 |
|
|
Extension 4 | 65,536 |
|
|
Use the following formulae to calculate the maximum possible number of pairs that can be created, based on the number of bitmap areas described in Table
Chapter 3 Preparing for Universal Replicator z/OS Operations |
