Today, the Linux machine suddenly found a problem: the directory cannot be accessed, and the following error occurs when running the ls command.
Run the df -h command to view the system hard disk condition.
Then use fdisk -h or lsblk to see which hard disks the machine has. Found only sdb and sdc. Then unmount and remount the correct disk to /webdata: umount /dev/sda mount /dev/sdc /webdata
finally accessible.
Original link: http://woqilin.blogspot.com/2016/06/linux-ls-inputoutput-error.html