tar백업시 socket ignored 메세지 뿌림

tar cvf /dev/st0 / --exclude=proc 를 스크립트로 작성하여 백업을 돌리면

tar: /tmp/orbit-admin/linc-7af-0-6ee5547135f25: socket ignored
tar: /tmp/orbit-admin/linc-7b1-0-1cf1726139731: socket ignored
tar: /tmp/orbit-admin/linc-7b6-0-1cf1726189aca: socket ignored
tar: /tmp/orbit-admin/linc-7c6-0-3a4de70cb05: socket ignored
tar: /tmp/orbit-admin/linc-7ba-0-31a5c0749c9dc: socket ignored
tar: /tmp/orbit-admin/linc-7b1-0-456a64ab7921a: socket ignored
tar: /tmp/orbit-admin/linc-7ad-0-456a64abb3c94: socket ignored
tar: /tmp/orbit-admin/linc-7af-0-74987519d84d0: socket ignored
tar: /tmp/orbit-admin/linc-7b4-0-1ab9c67e4f525: socket ignored
tar: /tmp/orbit-admin/linc-7c3-0-1b9c6edc64240: socket ignored
tar: /tmp/orbit-admin/linc-7b8-0-9a64757dee07: socket ignored
tar: /tmp/orbit-admin/linc-1904-0-7cc51758c76c7: socket ignored
tar: /tmp/orbit-oracle/linc-8c3-0-33d43cc438322: socket ignored
tar: /tmp/orbit-oracle/linc-8f5-0-33d43cc4e46e3: socket ignored
tar: /tmp/orbit-oracle/linc-906-0-2b9d3c6f2f1aa: socket ignored
tar: /tmp/orbit-oracle/linc-908-0-59e6c5453e451: socket ignored
tar: /tmp/orbit-oracle/linc-90a-0-59e6c54559ca2: socket ignored

이런 내용의 메시지를 뿌립니다.

뭐가 문제 인지?????????????????????