Error_messages

 SYSTEM-F-TIMEOUT, device timeout

     After waiting two minutes for the component(s) in question to
     acknowledge the shutdown request, the PMDF SHUTDOWN utility
     returns control to the command line. The shutdown request
     is still outstanding and should be honored by the PMDF
     component(s) for which the command was issued; the utility
     has just given up waiting for the component(s) to immediately
     acknowledge the request as it (they) may be busy with existing
     activity.