Oracle Inventory
The location of oracle's inventory you can set in file oraInst.loc
The location of the oraInst.loc file:
in HP-UX: /var/opt/oracle/oraInst.loc
in Linux: /etc/oraInst.loc
Content of oraInst.loc file:
inventory_loc=/ORACLE_INVENTORY_LOCATION/inventory
inst_group=dba
Detach ORACLE_HOME:
$ORACLE_HOME/oui/bin/runInstaller -silent -detachHome ORACLE_HOME="Name_Of_Oracle_Home"