DB2 on z/OS Mainframe

I understand at a high level database concepts and have come from SQL
Server 
and Windows

Is there any good link thats high level that compares Windows to z/os 
mainframe terminology ? I hear the mainframe guys talking about control 
blocks, DL/I,etc. etc..

Also would love DB2 comparison with SQL Server

BTw, are there differences between DB2 on LUW different from DB2 on z/OS ?

Thanks