issue about "mv: `/user/hive/warehouse/dsp_execution/2014-01-31/data_00000': Input/output error"

[ch huang]

hi,maillist :
            i need move datafile from one dir to another dir,but i find if
i type
hadoop fs -mv /A/* /B/  in commandline ,it's ok,but if i let shell do it
,it will get

"mv: `/user/hive/warehouse/dsp_click/2014-03-31/data_00000': Input/output
error"

i do not know why?