I'm using db2/os390 v.5 and sometimes during the reorganization index space with shrlevel change option I can see (in my opinion) too much number of log records than usually, e.g. everyday there is about 200 log records but sometimes are 10000 (50 times more). I'm sure, that the application doesn't generate this records. Maybe something is going inside db2 but I don't know what.
It relatives just second index that is not partitioned.