1、一台四节点的机器，共三块硬盘，前两块做RAID1，突然发现报大量如下错误，系统不可用，不知道什么原因：

 rejecting I/O to offline device

2、每打一个命令，提示

[root@localhost ~]# reboot

-bash: /sbin/reboot: 输入/输出错误

[root@localhost ~]# lsb_release 

-bash: /usr/bin/lsb_release: 输入/输出错误

3、系统日志

Jun  8 15:37:46 localhost kernel: sd 4:2:0:0: Device offlined - not ready after error recovery

Jun  8 15:37:46 localhost kernel: sd 4:2:0:0: Device offlined - not ready after error recovery

Jun  8 15:37:46 localhost kernel: sd 4:2:0:0: [sda] Unhandled error code

Jun  8 15:37:46 localhost kernel: sd 4:2:0:0: [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT

Jun  8 15:37:46 localhost kernel: sd 4:2:0:0: [sda] CDB: Write(10): 2a 00 00 5d 61 85 00 00 08 00

Jun  8 15:37:46 localhost kernel: end_request: I/O error, dev sda, sector 6119813

Jun  8 15:37:46 localhost kernel: sd 4:2:0:0: [sda] Unhandled error code

Jun  8 15:37:46 localhost kernel: sd 4:2:0:0: [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT

Jun  8 15:37:46 localhost kernel: sd 4:2:0:0: [sda] CDB: Read(10): 28 00 00 70 bf 0d 00 00 08 00

Jun  8 15:37:46 localhost kernel: end_request: I/O error, dev sda, sector 7388941

^C