Special fields for error recovery are provided in data set information
tables of data sets written with synchronized transactions. If a
transaction only partially fills a data set, that data set is rewritten in
a succeeding data set, appending the next transaction. A moving access
point in the table identifies the appended transaction, allowing the
rewritten transaction to be skipped during read recovery. The table
provides recovery trails by providing a thread to tie the data sets
together, the status of the data set, and pointers, such as identifying
the wrap of the immediately succeeding data set.
