HP StorageWorks XP Remote Web Console Software - Manual (Page 25)

available pair tables for XP Snapshot pairs by subtracting the number of differential tables Hitachi
FlashCopy Mirroring Version 2 pairs use from the number of pair tables for the whole array.
For information about checking the number of pair tables Hitachi FlashCopy Version 2 uses (that is,
the number of existing Hitachi FlashCopy Version 2 pairs), see the Hitachi ShadowImage for z/OS
user guide.
For example, when the relationship expansion function is enabled and the number of pair tables
Hitachi FlashCopy Mirroring Version 2 uses is 30,000, calculate the number of XP Snapshot pairs
you can create for an array as follows.
32,768 - 30,000 = 2,768
According to this result, you can create a maximum of 2,768 XP Snapshot pairs.
XP Snapshot User Guide 25