You are implementing MIM on a systems and at the first IPL, the system just hangs.
The start-up of JES hangs with the messages:
MIMES004I JES2 waiting on SYSZJES2
MIMES004I JES2 waiting on SYSVTOC
*@HASP709 JES2 INITIALIZATION DELAYED - CHECKPOINT DATA SET RESERVE
Release : 12.5
The MIMES* messages are normal when CAMIMGR is started using the Early Start Mechanism. These messages indicate that the GRS exit has been planted and that an ENQ requestor is being suspended.
The GRS exit starts CAMIMGR with SUB=MSTR so it can be started before JES2.
MIM is not completing synchronization...Until synchronization completes everything will essentially get stuck, which is what I suspect is happening with JES2.
The recommendation is to determine why CAMIMGR did not synchronize - possible causes:
Make sure all the other items related to Early Start Mechanism are satisfied.
Early Start can be bypassed by removing the entry from the PROGxx member, but then CAMIMGR will need to be started manually.