（1） Oracle rman备份失败，校验坏块，报错如下

（2）多个数据文件中都有报错

（3）坏块查询不到

（3）日志输出如下
ORA-27061: waiting for async I/Os failed
Linux-x86_64 Error: 5: Input/output error
Additional information: -1
Additional information: 1048576
WARNING: Read Failed. group:1 disk:0 AU:85854 offset:0 size:1048576
WARNING: failed to read mirror side 1 of virtual extent 22107 logical extent 0 of file 258 in group [1.3648725922] from disk DATA_0000 allocation unit 85854 reason error; if possible, will try another mirror side