You will define the maximum allowable number of log streams that map to a coupling facility structure on the LOGSNUM parameter for each structure in the LOGR policy in a later step, (Add information about log streams and coupling facility structures to the LOGR policy).

Because system logger divides the structure storage evenly among each log stream that writes to it, it is important to plan carefully what value you want to specify for LOGSNUM and how many of the log streams defined to a shared coupling facility structure will be active at any one time. The more connected log streams that share a coupling facility structure, the less coupling facility space each one has. In addition, when a structure is allocated for system logger, some of the structure space is taken up for control information for each log stream that could be connected to this structure. The higher the number for LOGSNUM, the more coupling facility control space is consumed.

In general, the value you define for LOGSNUM should be as small as possible. IBM® recommends that you configure 20 or fewer log streams into one structure.