Automatic DB startup at boot

I'm running Oracle under SCO Unix Openserver 5.0. Recently I migrated from Oracle 7.2.2.3 to 7.3.2 and now having problem starting the database instance automatically at system boot time. I followed the manual and faq, checked out /etc/oratab and everything seems to be OK. When I manually executing $ORACLE_HOME/bin/dbstart, the dbstart script is complaining "not able to find 'ior' file of directory". I did a 'find' for the entire system and sure enough no ior. (BTW, I went back to the backup 7.2.2.3 system and compared dbstart script between the two releases; found no diff. I also try to find ior on the backup machine; no luck there either...)

Q1: Did I missed something in my install? Q2: Why 7.3.2 gets into the ior part of the script, while 7.2.2.3 doesn't?

Any help will be appreciated...

--

Bob Hung (EDS-Air Transportation Services)
(eMail     bhun_at_latcost1.alaao.ats.eds.com
or         msusla01.bhung01_at_eds.com)