Check to see if the hotplug feature loaded the SCSI module for the SCSI interface card. (lsmod) If not then you will need to load it. Once loaded, then check the end of /var/log/messages and/or the dmesg command for the discovered devices on the SCSI bus. If the tape drive was located it should be assigned the device of /dev/st0. Check the symlink /dev/tape (ls -l /dev/tape) to see what device it reports as the current setting. If it is not /dev/st0, then I suggest "ln -sf /dev/st0 /dev/tape" to set it. All operations are logged in as root.
With a tape inserted in the drive, the command "mt retension" should retension the tape cartridge. If that works then all should be well.
The device /dev/tape and /dev/st0 should be interchangeable. To do a backup use the "tar" command. Something like below.
tar -czvf /dev/st0 /etc
The archive should then be readable using,
tar -tzvf /dev/st0
For more info on using the tar command, I suggest the man page. (man tar)
Good luck.
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