Hi,
I too face same problem as you.... Actually i learned COBOL,JCL and DB2 all. Now i got the job as Mainframes Tester on Health Insurance domain... Those COBOL, JCL and DB2 not useful to me. It's complete quite different to Mainframes....
In our testing situation like this try to find out the info in some other friends who are working on Testing..........
Thanks,
RamS