In some cases, a tape can be falsely identified as a poor medium. This can happen if the backupjob was killed by a server reboot or a kill of the BSM.exe process. The poor state withholds Data Protector to use the tape.
The command below gives you the ability to reset the poor medium back to the original state.
omnimm -reset_poor_medium "Medium"
As a best practice note the media identifier (the label) down together with the date when the tape was “reinitialized”.
The purpose is to have a trace-back to see if a certain tape throws this error multiple times. In that situation it’s advised to remove the tape from the library.