Hitachi ShadowImage for IBM z/OS User"s Guide (T5213-96002, June 2007)

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Hitachi ShadowImage™ for IBM
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User’s Guide
When you round up 2.4537 to the nearest whole number, it becomes 3.
Therefore, the total number of the differential table for one pair is 3 when
emulation type is 3390-3.
You may use 36 differential table per one pair table. Therefore, the total
number of the pair tables is 1 when emulation type is 3390-3. For
example, if the emulation type is 3390-M and the number of the cylinders
of the volume is the default value, the number of pair tables is 2. However,
only the emulation type 3390-M can be used, if you use plural pair tables
on a mainframe system.
The following table shows the number of the control cylinders according to
the emulation types.