HP XP Racks - Manual (Page 20)

Table 13 Number of control cylinders based on emulation type (continued)
Number of Control Cylinders Emulation Type
23 3390-L, 3390-LA, 3390-LB
53 3390-A, 3390-M, 3390-MA, 3390-MB, 3390-MC,
6588-A
23 3390-LC
3390-3 emulation type example
For this example, the emulation type of the mainframe volume is 3390-3. Recall the formula for
calculating the required amount of differential tables per migration plan:
(X (number of volume cylinders) + Y (number of control cylinders)) Ч 15 ч Z (number of slots that
can be managed by a differential table)
The number of volume cylinders for the 3390-3 emulation type is 3,390. The number of control
cylinders for the 3390-3 emulation type is 21 (see the preceding table). The number of slots that
can be managed by a differential table is 20,448. The formula is calculated below:
(3,339 + 21) Ч 15 ч (20,448) = 2.464788732
When you round up 2.464788732 to the nearest whole number, it becomes 3. Therefore, the
total number of required differential tables for each migration plan is 3 when the emulation type
is 3390-3.
One pair table can be used for 36 differential tables. Therefore, the number of pair tables for one
migration plan is 1 when the emulation type is 3390-3. Two pair tables are used if the emulation
type is 3390-M and the number of volume cylinders is default number.
Calculating the required amount of differential tables for an open-system
volume
When you migrate open-system volumes, you must determine the total number of required differential
tables and pair tables per migration plan. The equation to calculate the required amount of
differential tables will vary based on the emulation type. Figures are rounded up to the nearest
whole number.
Control cylinders by open emulation type
Before you can calculate the required amount of differential tables per migration plan, you must
know the number of control cylinders contained by the open-system 3,019,898,880 volume. The
following table shows the number of control cylinders based on the emulation type.
Table 14 Number of control cylinders and capacity based on emulation type
Control Cylinders (Capacity) 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
Differential tables calculation for an OPEN-V volume
The following equation is used to calculate the required amount of differential tables for an OPEN-V
volume.
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