The recovery journal is on the recovery server, and holds redo and undo logs, that act as Assure MIMIX for AIX’s internal rollback window. If you are using external archive media such as tape, then the size of the journal on the recovery server is not critical to the ability to restore data. The larger the recovery journal, the larger the internal rollback window, which implies faster access to redo and undo logs during production restores in that window.