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→External TTYs: explain why mnt_id:inode is not used for TTYs
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=== External TTYs ===
=== External TTYs ===
−The format of tty id is <code>tty[''rdev'':''dev'']</code>. Why can we not use a pair of <code>mnt_id</code> and <code>inode</code> here?
+The format of tty id is <code>tty[''rdev'':''dev'']</code>. Note that a pair of <code>''mnt_id'':''inode''</code> is not used here, as there can be two device files with the same <code>''rdev''</code> but different inode numbers.
+Here is an example of dumping and restoring an external TTY:
<pre>
<pre>
$ ipython
$ ipython