Cannot overwrite active tape
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Problem
The following error from amdump(8):
cannot overwrite active tape
Solution
Check if the correct tape is used. Amanda expects the tape given by
amadmin <conf> tape
Check that your tapecycle is set to at least one greater than dumpcycle (amcheck(8) should show a WARNING if this is not the case), otherwise you might try to overwrite a tape that is still in the active dumpcycle. Amanda prevents you from doing that, by refusing to overwrite that tape.