We're doing some invasive maintenance and year-end cleanup down at the datacenter today (12/27/2013). You may notice some service interruptions and glitches on perl.org, pm.org, cpan.org, and other hosted sites.
One of the things we're doing:
dd if=/dev/zero of=/dev/sda bs=1M &
The maintenance completed without incident (and went very smoothly. Almost too smoothly.) We've been monitoring the systems for two hours, and everything seems stable and happy.