are you, by chance, talking about DB2 Express C and/or installing DB2 on Hercules...
You cannot install DB2 on Hercules, Hercules is a bare iron emulator,
You will have to install first an operating system capable of supporting db2,
but IBM will not license any to run on Hercules
and anyway apart that, the appearance of zOS will be the same on real iron and on Hercules.
so the problem for DB2 is not hardware related, just <zOS> related