If you log in as root with the Bourne shell (/bin/sh) and run asadmin commands, then log out of the console window, all the domain administration server (DAS), node agent, and instance processes are killed. This is because in the Bourne shell all child terminals inherit the TTY by default, so when the terminal is logged out, all child processes are killed too.
Before running any asadmin commands, do the following:
Log in to the server.
Change to K shell:
# exec /bin/ksh
In K shell, run all the asadmin commands to bring up the DAS, node agents, and instances.