  Quantum discord, and a number of related indicators, are currently raising a
relentless interest as a novel paradigm of non-classical correlations beyond
entanglement. Beside merely fundamental aspects, various works have shown that
discord is a valuable -- so far largely unexplored -- resource in quantum
information processing. Along this line, quite a striking scheme is
{entanglement activation}. An initial amount of discord between two
disentangled parties of a multipartite system affects the dynamics so as to
establish entanglement across a bipartition, which would not arise otherwise.
To date, such a process was proven to be achievable only dynamically, i.e.,
with no guarantee of a stationary entanglement throughput in the presence of
noise. Here, we discover a {\it discord-activated mechanism yielding
steady-state entanglement} production in a realistic continuous-variable setup.
This comprises two coupled optomechanical cavities, where the optical modes
(OMs) communicate through a fiber. We first use a simplified model to highlight
the creation of steady-state discord between the OMs. We show next that such
discord improves the level of stationary optomechanical entanglement attainable
in the system, making it more robust against temperature and thermal noise.
