2.1 HP-UX Configuration
a. create the /dev/async character device
% /sbin/mknod /dev/async c 101 0x0
% chown oracle:dba /dev/async
% chmod 660 /dev/async

The kernel driver was installed and the
/dev/async special file was created.
Instead of
mknod /dev/async c 101 0x000004
per Informix instructions.
To clear (or not) things a little. Everything was working perfectly until usage started getting high.