HP StorageWorks XP Remote Web Console Software - Manual (Page 26)

how to calculate the number of differential tables and pair tables used by programs other than XP
Auto LUN, see the following manuals:
•
For XP Business Copy, see the HP StorageWorks XP24000/XP20000 Business Copy Software
User Guide.
•
For ShadowImage for Mainframe, see the Hitachi ShadowImage™ for Mainframe User Guide:
HP XP24000 Disk Array, HP XP20000 Disk Array.
•
For FlashCopy Mirroring and FlashCopy Mirroring V2, see the HP StorageWorks
XP24000/XP20000 for FlashCopy Mirroring Software User Guide.
•
For XP Snapshot, see the HP StorageWorks XP24000/XP20000 Snapshot User Guide.
Calculating Differential Tables Required for Mainframe Volume Migration
When you migrate mainframe volumes, use the following expression to calculate the total number
of the required differential tables and pair tables per migration plan.
Total number of the differential tables per migration plan = ((X) + (Y)) Ч 15 ч (Z)
(X): The number of cylinders of the volume to be migrated
*1
(Y): The number of control cylinders
(Z): The number of slots that can be managed by a differential table (20,448)
*1
If the volume is divided by the VLL function, this value is the number of the
cylinders of the divided volume.
NOTE: Round up the number to the nearest whole number.
For example, if a volume has an emulation type of 3390-3 and the number of cylinders on the
volume is 3,390 ((X) in the expression), the calculation of the total number of differentials tables
is as follows:
(3,339 + 6) Ч 15 ч (20,448) = 2.453785211
When you round up 2.453785211 to the nearest whole number, it becomes 3. Therefore, the
total number of differential tables for one 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 the default number. The emulation type is
3390-M if multiple pair tables are used on a mainframe system.
Table 9 (page 26) shows the number of control cylinders according to the emulation types.
Table 9 Number of Control Cylinders According to Emulation Types
Number of Control Cylinders Emulation Type
7 3380-3
7 3380-3A
7 3380-3B
7 3380-3C
22 3380-F
7 3380-K
7 3380-KA
7 3380-KB
7 3380-KC
26 About XP Auto LUN Operations