Example for Multiple Versions of a Data Set

                 ┌─────────────┬──────────────┐ 
VOLUME 333333    │    A.B.C    │    X.Y.Z     │ 
                 └─────────────┴──────────────┘ 
                 ┌────────────────────────────┐ 
VOLUME 444444    │          A.B.C'            | 
                 └────────────────────────────┘ 

Volume 333333 was mounted 3 times. 

Volume 444444, which contains a later version of A.B.C, was mounted 4 times. 

Statistical mounts for A.B.C 
       = (mounts for volume 333333/# of data sets on volume 333333) 
       + (mounts for volume 444444/# of data sets on volume 444444) 
       = 3/2 + 4/1 = 5.5 statistical mounts

This example shows that data sets can change their characteristics during the reporting period of the SMF sample. Since statistical mounts reflect all mounts for a data set during the time of the study, the number of statistical mounts for data set A.B.C is 5.5; the volume mount analyzer calculates mounts for both versions of A.B.C, first as multifile on volume 333333 and then as single file on volume 444444.