The 'size' at which you unleash the chaos-monkey is i think a matter of a lot of subjectivity. The QoS expected is one factor. Can you afford to fail? Formall

The 'size' at which you unleash the chaos-monkey is i think a matter of a lot of subjectivity. The QoS expected is one factor. Can you afford to fail? Formally, two 'requirements', in order to randomly kill your servers are- 1. You have Highly Available infrastructure. 2. You have fail-over established across the architecture.