If for whatever reason you need to know which IODF file is currently being used by the system, just issue the command: D IOS,CONFIG
Example:
D IOS,CONFIG
Returns:
RESPONSE=TST1
IOS506I 10.18.20 I/O CONFIG DATA 118
ACTIVE IODF DATA SET = SYS1.IODF19
CONFIGURATION ID = TEST01 EDT ID = 00
TOKEN: PROCESSOR DATE TIME DESCRIPTION
SOURCE: CMOS03 08-02-19 14:05:33 SYS1 IODF19
ACTIVE CSS: 0 SUBCHANNEL SETS CONFIGURED: 0
CHANNEL MEASUREMENT BLOCK FACILITY IS ACTIVE
As you can see LPAR TST1 is currently using IODF file SYS1.IODF19
