Hello Gerhard,
When we moved z/VM 5.4 from Z114 to zBC12 I made the mistake of not reading carefully Upgrade 2828DEVICE, Subset 2828/ZVM and I missed an APAR.
That mistake cause the system to crash right after IPL on the new zBC12, causing a virtual heart attack. Using the local IBM branch help and sending the dump to IBM we discovered and installed the missing APAR.
So please read carefully and apply all APARS that are relevant.
Regards,
Avihu Gershoni
Mainframe System Department Manager
Hilan Limited
8 Meitav Street
Tel Aviv
Israel