TIOT - Documentation for MainView SYSPROG Services 6.1
Marcus Reynolds updates
Within a concatenation, if more than one of the data sets are allocated to a common volume, TIOT attributes all the EXCPs for the data sets sharing that volume to the first data set within the concatenation that is on the current volume.
For data sets sharing a common volume within a concatenation, IBM updates the TCT I/O table only for the first data set in the concatenation that resides on that volume.