On older versions of UnixWare ArcServe was available. ArcServe has a quirk where is takes over exclusive control of the tape drive when it is installed. Other commands like cpio and tar will not work with your tape drive until you type, as root,
astop
This stops the ArcServe daemon and returns tape control to the system. When you are finished using the tape, go ahead and type astart to return control to ArcServe. On a side note, most people prefer a 'super-tar' program from a third party vendor for their backup needs.
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