HP XP Business Copy Software - Manual (Page 45)

Table 15 Total Number of Differential Tables Per Pair
Expression Emulation Type
Total number of the differential tables per pair = ((X) 48 + (Y) x 15) (Z)
(X): The capacity of the volume. (KB)*
(Y): The number of the control cylinders. (See Table 16 (page 45) .)
(Z): 20,448 (The number of the slots that can be managed by a
differential table)
Note that you should round up the number to the nearest whole number. For example,
if the emulation type of a volume is OPEN-3, and when provided that the number of the
cylinders of the divided volume is 2,403,360 KB ((X) in the expression above), the
calculation of the total number of the differential tables is as follows:
(2,403,360 48 + 8 x 15) 20,448 = 2.4545...
When you round up 2.4545 to the nearest whole number, it becomes 3. Therefore, the
total number of the differential tables for one pair is 3 when emulation type is OPEN-3.
You may use 36 differential table per one pair table. The total number of the pair tables
is 1 when emulation type is OPEN-3.
OPEN-3, OPEN-8, OPEN-9,
OPEN-E, OPEN-L
Total number of the differential tables per pair = ((X) 256) (Z)
(X): The capacity of the volume. (KB)
(Z): 20,448 (The number of the slots that can be managed by a
differential table)
Note that you should round up the number to the nearest whole number. For example,
if the emulation type of a volume is OPEN-V, and when provided that the number of the
cylinders of the divided volume is 3,019,898,880 KB ((X) in the expression above), the
calculation of the total number of the differential tables is as follows:
(3,019,898,880 256) 20,448 = 576.9014...
When you round up 576.9014 to the nearest whole number, it becomes 577. Therefore,
the total number of the differential tables for one pair is 577 when emulation type is
OPEN-V.
You may use 36 differential table per one pair table. The total number of the pair tables
is 17 when emulation type is OPEN-V. The emulation type of case when multiple pair
tables are used in the open system is only OPEN-V.
OPEN-V
If the volume is divided by VLL function, you need to apply the capacity of the volume after the
division. You cannot perform VLL operations on an OPEN-L volume. Therefore, if the emulation
type is OPEN-L, the value substitute for (X) is the default capacity of the volume.
Table 16 (page 45) lists the number of the control cylinders according to the emulation types.
Table 16 Number of Control Cylinders According to Emulation Types
Number of the Control Cylinders Emulation Type
8
(5,760 KB)
OPEN-3
27
(19,440 KB)
OPEN-8, OPEN-9
19
(13,680 KB)
OPEN-E
Assessing Requirements 45