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Reason:
The device cannot be attached because the specified virtual address is associated with a virtual control unit (VCU) that already is in use with a NONSHARED device. (Tape devices use a SHARED subchannel protocol, and you cannot mix SHARED and NONSHARED devices on a single VCU.)
Action:
Reissue the ATTACH command, specifying a different virtual device address, or detach all other devices from the virtual control unit and reissue the ATTACH command.
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