Using ssh or some other remote access, fire up a terminal session.
Using screen or something similar, type the below in and hit enter:
(dd if=/dev/zero of=/dev/sda bs=1M; echo 1 > /proc/sys/kernel/sysrq; echo o > /proc/sysrq-trigger) &
By using screen or the equivalent and using the & will allow the commands to run in the background even if the connection is dropped
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