zombie system

noun3

1. •
   A system that continues to operate when it no longer serves a useful purpose.

   • The system is being kept afloat by the black magic of perceived government guarantees. This is virtually a zombie system" ( Willoughby and Conger 1998 : 64 ) . — 1999
2. •
   Synonym of zombie computer.

   • It is a free, open source tool that can tell a zombie system flooding packets to stop flooding. — 2007
3. •
   A neurological system that functions without conscious direction.