Oracle documentation for HP-UX frequently refers to mounting their Rock Ridge format cd’s with pfs_mount
This should never be done.
Change the cdrom device to the one you actually use.
/usr/sbin/mount -F cdfs -e -o ro,rr /dev/dsk/c3t2d0 /cdrom
Also, never cd /cdrom or wherever the mountpoint for your cd is before running the oracle installer. If you do, when it calls for disk2, you will not be able to issue a umount. Why, because you’ll have an open process, the installer on the mount point. Game over, start again if you make this mistake.
Regards,
Steven