mysql is dead but subsys locked

Question

I am using PHP-mysql on Linux (RHEL 5.0) For First Time
When I tried to connect to MySQL from my PHP Script using mysqli_connect.
It Displayed

Answer 1

This (and all sorts of other weird errors) can also happen if you have a full disk. In my case, my /var partition had filled up. Freeing up space allowed mysqld to restart again.