If you are monitoring the effect that RLS and DFSMStvs have on online CICS® transactions, you should look at CICS statistics as well as system logger and SMSVSAM information to gain the complete picture.

The CICS statistics titled File: requests information give you information about the types of accesses to files open in CICS. You can produce reports with this information by using the DFHSTUP program supplied with CICS.

You can also use CICS Monitoring Facility data to break down transaction response time into its components, including I/O time.