Read-only file system怎么办

btfs

我按照网上的教程
fsck.ext4 -y /dev/md3
mount -o remount -rw  /

root@ns532776:~# fsck.ext4 -y /dev/md3
bash: /usr/sbin/fsck.ext4: Input/output error
root@ns532776:~# mount -o remount -rw  /
mount: /: /dev/md3 is write-protected but explicit read-write mode requested.