HP XP Business Copy Software - Manual (Page 16)

Equation Emulation type
Total number of differential tables per pair = (X ч 256) ч (Z)
•
(X): Volume capacity (KB)
2
• (Z): Number of slots that can be managed by a differential table (61,312)
NOTE:
Round the result of the calculation up to the nearest whole number.
For example, if the volume capacity (X) is the maximum OPEN-V volume capacity of
3,019,898,880 KB, the total number of differential tables is calculated as follows:
(3,019,898,880 ч 256) ч 61,312 = 192.40084
When you round up to the nearest whole number, the result is 193. Therefore, the
total number of differential tables for a pair is 193 when the emulation type is OPEN-V.
OPEN-V
1
If the selected volume is a CVS (custom volume size) volume, use the capacity of the custom volume instead of the default
volume capacity for the emulation type. Since the OPEN-L emulation type does not support custom volume operations, you
must use the default volume capacity of OPEN-L for X.
2
1 KB equals 1024 bytes.
Table 3 Number of control cylinders according to emulation types
Number of control cylinders Emulation type
8 (5,760 KB) OPEN-3
27 (19,440 KB)
OPEN-8
OPEN-9
19 (13,680 KB) OPEN-E
7 (5,040 KB) OPEN-L
0 (0 KB) OPEN-V
Table 4 shows the relationship between emulation type, capacity, and differential tables. Table 5
shows the number of differential tables used in OPEN-V.
Table 4 Relationship between emulation type, capacity, and differential tables
Differential tables per
pair
Capacity
1 Emulation type
1 Does not depend on capacity OPEN-3
1 Up to 2.7GB
OPEN-9 2 Up to 5.5GB
3 Up to 6.8GB
1 Up to 2.7GB
OPEN-E
2 Up to 5.5GB
3 Up to 8.4GB
4 Up to 11.2GB
Business Copy XP (BC) for the Array 16