Use the following formula to calculate the required number of differential tables. If you use a DP-VOL whose size exceeds 4 TB, you do not need a differential table.
Total number of differential tables per migration pair = (X / 256) / Z
Where:
- X = capacity of the migration source volume (in kibibytes)
If the volume is divided by the Virtual LVI/LUN function, this value is the capacity of the divided volume.
- Z = number of the slots that can be managed by a differential table
Example:
- X = 3,019,898,880 kibibytes
- Z = 20,448
Total number of required differential tables:
(3,019,898,880 / 256) / 20,448 = 576.9014085
When you round up 576.9014085 to the nearest whole number, it becomes 577. Therefore, the total number of required differential tables for the migration pair is 577.
One pair table can be used for 36 differential tables. Therefore the number of pair tables for one pair is 17.