Recovery with incremental copies

RECOVER tries to merge all of these incremental image copies into one copy. To do this merging, all of these copies must be available at the same time. In some cases, this requirement can strain your system resources, for example, by demanding more tape units than are available. However, even if all of these copies cannot be made available at the same time, the utility still uses whichever incremental image copies it can.

During recovery, the utility dynamically allocates the full image copy and then attempts to dynamically allocate all required incremental image copy data sets. If RECOVER successfully allocates every incremental copy, recovery proceeds to merge pages to table spaces and apply the log. If a point is reached where an incremental copy cannot be allocated, RECOVER notes the log RBA or LRSN of the last successfully allocated data set. RECOVER stops trying to allocate any more incremental image copy data sets and merges only those data sets that have already been allocated. RECOVER then applies the log from the noted RBA or LRSN, and ignores the incremental image copies that were not allocated.