If your protocol does not require the use of record data entries, then no additional storage in the coupling facility is required beyond that for the lock table. However, if you are using record data entries, keep in mind the following:

• Each record data entry is 64 bytes. (This is the user-available portion. The coupling facility control code requires additional coupling facility storage for control purposes.)
• The number of record data entries to estimate is a function of the number of users and their recording activity. The amount of recording activity is a product of the locking rate, the number of resources using record data, and the length of time resources and their associated record data entries are held.
• The coupling facility allocates storage for the lock table first and whatever storage remains in the structure can be used for record data entries.