System disk of a physical machine in a read-only disk space remaining cases, after consultation with the modified system was found a few days ago, and then you can not write, do not restart the line. See below
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1. to see -h df
[root @ localhost etc] # df -Th
file system type Size Used Avail Use% mount point
/ dev / Mapper / XFS CentOS the root 34G-32G 1.3G. 4% /
2. remount
Mount -o RW, the remount / dev / Mapper / CentOS-the root /
3. rewriting discovery has returned to normal
Ask someone was likely to be found when modifying certain system file corruption, the file system will be enabled to protect themselves disk becomes read only. File using the fsck command can scan and repair the damage, the specific use of their own to learn it!