  The evolution of the magnetic field from the large-scale dynamo is considered
a central feature of the accretion disk around a black hole. The resulting
low-frequency oscillations introduced from the growth and decay of the field
strength, along with the change in field orientation, play an integral role in
the accretion disk behavior. Despite the importance of this process and how
commonly it is invoked to explain variable features, it still remains poorly
understood. We present a study of the dynamo using a suite of four global,
high-resolution, MHD accretion disk simulations. We systematically vary the
scale height ratio and find the large-scale dynamo fails to organize above a
scale height ratio of $h/r \gtrsim0.2$. Using spacetime diagrams of the
azimuthal magnetic field, we show the large-scale dynamo is well-ordered in the
thinner accretion disk models, but fails to develop the characteristic
"butterfly" pattern when the scale height ratio is increased, a feature which
is also reflected in the power spectra. Additionally, we calculate the dynamo
$\alpha$-parameter and generate synthetic light curves. Using an emission
proxy, we find the disks have markedly different characters as stochastic
photometric fluctuations have a larger amplitude when the dynamo is unordered.
