Methods, storage facilities and computer software products implement embodiments of the present invention that include mapping, by a storage system including one or more storage devices, a set of storage blocks on a given storage device to a redo log file configured to store transactions performed by a transaction processing system. An archiving condition is specified, and upon the transaction processing system completing a given transaction a copy of the given transaction is stored to the redo log file. Upon the archiving condition being met, the storage system can remap the set of storage blocks to an archive log file.