Unable to swap during Oracle installation

Q: I installed in the REDHAT8 on the oracle9i process, prompted to change the second disc, but my optical drive is not back out, how to do?

The CD-ROM drive is loaded with the Mount command, but when I change the disk, I use the Umount command prompt to busy the disc. What do we do?

Wait for!!!! Online

A: The Oracle installer should be performed like this
/mnt/cdrom/runinstaller,

If you were cd/mnt/cdrom first, this would be a problem.

The solution is to find the process that accesses the optical drive first.
Fuser-m/mnt/cdrom
If you kill this process again, you can eject the optical drive.