HP XP7 Auto LUN User Guide (TK915-96001)

3 Auto LUN planning
This topic provides information about Auto LUN planning.
Migration plans
To migrate volumes, you must create migration plans. A migration plan is required for each volume
that you want to migrate, and each plan includes a source volume and target volume.
Execute multiple migration plans continuously
• When you create migration plans, the volume configuration may change for every migration
plan execution.
• Up to eight migration plans can be applied each time you click Apply in the Migration Plan
window. If you want more than eight migration plans, you must click Apply multiple times.
• You can apply the next migration plan during the migration plan execution.
• The number of migration plans that can be executed concurrently might be restricted based
on emulation types and sizes of the migrated volumes, and on the resources being used by
other programs.
Estimating differential tables
Differential tables are resources shared by Auto LUN, Business Copy, Business Copy Z, and
Compatible FlashCopy. Because an Auto LUN source volume still accepts I/O write operation
during an Auto LUN operation, differential tables are used to track and copy the differential data
to the target volume, which ultimately becomes the migrated volume. The subsequent topics provide
formulas for estimating the amount of differential and pair tables that you will need per migration
plan.
Calculating the required amount of differential tables for a mainframe
volume
When you migrate mainframe volumes, you must determine the total number of required differential
tables and pair tables per migration plan. Use the following equation to calculate the required
amount of differential tables. Figures are rounded up to the nearest whole number.
Total number of the differential tables per migration plan = (X + Y) × 15 ÷ Z
The variables are explained below:
• X: The number of volume cylinders to be migrated. If the volume is divided by the Virtual LVI
function, this value is the number of cylinders in the divided volume.
• Y: The number of control cylinders.
• Z: The number of slots that can be managed by a differential table.
Control cylinders by mainframe 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 mainframe volume. The following table
shows the number of control cylinders based on the emulation type.
Table 13 Number of control cylinders based on emulation type
Number of Control CylindersEmulation Type
213390-3, 3390-3A, 3390-3B, 3390-3C
253390-9, 3390-9A, 3390-9B, 3390-9C
Migration plans 19