As the subject (My filer is FAS2050 running DOT 7.3.6), I followed the procedure as below,
In order to utilize one of the Configuration Files (TCF), perform the following steps:
7-Mode Storage System:
Choose the appropriate Configuration File from the table, and right-click on the Configuration File. Click "Save As…" and download the Configuration File. If a file extension has been added by your browser (such as .txt), rename the Configuration File to the file name as it appears in the table.
Place the Configuration File into the /etc/tape_config directory.
On the storage system console, run sysconfig -t and confirm that the tape drives are recognized.
Note: You might have to reboot the storage system for SCSI attached tape drives to be recognized.