number of logs = (journal size) / (log size)
Even though the calculation for the number of log files appears trivial, keep in mind that the number of log files can affect performance. If enough log files are available on the production server, Assure MIMIX for AIX does not have to rely on state maps during an outage, because it has not run out of log files to take in data. A state map contains information about data changes for each storage device protected by Assure MIMIX for AIX. It can be used to reconstruct data changes if the underlying data is corrupted or lost. During peak usage, when an application is writing data faster than the network can transmit, extra log files enable the system to buffer during these peak periods without having to rely on state maps, eliminating the risk of a restore blackout window. On the recovery server, a sufficient number of log files allows activity to be buffered in the event that the tape drive or library is taken offline.
The Planning your Environment contains information and formulas to help you size the logs for your system.