Regenerate the sysutils database

If you lose the sysutils database, use the bldutil utility in $INFORMIXDIR/etc on UNIX or %INFORMIXDIR%\etc on Windows to recreate the sysutils database with empty tables.

Then use the onsmsync utility to recreate the backup and restore data in sysutils.
Restriction: If both the sysutils database and emergency boot file are missing, you cannot regenerate them with onsmsync. Be sure to back up the emergency boot file with your other operating-system files.