HP XP7 Storage - Manual (Page 151)

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When the delta resync pair is created and no volumes (including volumes after failover or
failback) in the local site are updated.
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When the status of the Cnt Ac-J Z pair for delta resync operation becomes Hlde, the journal
data necessary for the delta resync operation might be discarded. In this case, all data in the
delta resync P-VOL would be copied to the delta resync S-VOL.
However, you should check whether differential data can be copied by executing the Business
Continuity Manager YKRESYNC DELTAJNL ERRCHK command.
Delta resync configuration 151