ls /sys/class/scsi_device/
echo 1 > /sys/class/scsi_device/1\:0\:0\:0/device/rescan
echo 1 > /sys/class/scsi_device/2\:0\:0\:0/device/rescan
echo 1 > /sys/class/scsi_device/2\:0\:1\:0/device/rescan
echo 1 > /sys/class/scsi_device/2\:0\:2\:0/device/rescan
扩容/dev/sdc盘后系统内还是源大小100G 没有识别到 通过重新扫描scsi设备方式成功解决；
此链接是centos7 新添加磁盘系统内未识别解决方法
centos7 热识别到新添加的磁盘
