HP XP P9500 Storage - Manual (Page 35)

The following software programs share the resources used for copy operations:
•
Business Copy Z
•
Business Copy
•
Fast Snap
•
Snapshot
•
Auto LUN
The resources used by Business Copy Z, Business Copy, Fast Snap, Snapshot, and Auto LUN
cannot be used for Compatible FlashCopy. The resources that remain, when you exclude the
resources used by Business Copy Z, Business Copy, Fast Snap, Snapshot, and Auto LUN from the
total resources, are available resources for Compatible FlashCopy. See the following manuals for
details about the calculation of the resources used by each software program.
•
HP XP P9000 Business Copy for Mainframe Systems User Guide
•
HP XP P9000 Business Copy User Guide
•
HP XP P9000 Fast Snap User Guide
•
HP XP P9000 Snapshot User Guide
•
HP XP P9000 Auto LUN User Guide
Establishing relationships by volume copying
Use the following expression to calculate the total number of the resources to be used per
relationship.
Total number of the differential tables per relationship =
ceil((X + Y) Ч 15 ч Z)
(X): The number of the cylinders of the volume.
(Y): The number of the control cylinders. (See the following table.)
(Z): The number of the slots that can be managed by a differential table.
(639 X 32)
ceil: Round up the number to the nearest whole number.
The following table shows the number of the control cylinders for each emulation type.
Table 21 Number of control cylinders for each emulation type
Number of the control cylinders Emulation type
7 3380-3
5 3390-1
6 3390-2
6 3390-3
25 3390-9
ceil(number of user-defined cylinders/1113) x 7 3390-A
23 3390-L
53 3390-M
The number of resources to be used per a relationship is the total number of the resources of the
copy source and copy target. For example, in case of a 3390-3 volume and when the number of
the cylinders of the divided volume is 3,390 ((X) in the expression that calculates the total number
of the resource) the calculation of the total number of the differential table is as follows:
Calculating the maximum number of Compatible FlashCopy relationships 35