  The High Energy Stereoscopic System (H.E.S.S.) is an array of five Imaging
Atmospheric Cherenkov Telescopes located in the Khomas Highland of Namibia.
H.E.S.S. observes gamma rays above tens of GeV by detecting the Cherenkov light
that is produced when Very High Energy gamma rays interact with the Earth's
atmosphere. The H.E.S.S. Data Acquisition System (DAQ) coordinates the nightly
telescope operations, ensuring that the various components communicate properly
and behave as intended. It also provides the interface between the telescopes
and the people on shift who guide the operations. The DAQ comprises both the
hardware and software, and since the beginning of H.E.S.S., both elements have
been continuously adapted to improve the data-taking capabilities of the array
and push the limits of what H.E.S.S. is capable of. Most recently, this
includes the upgrade of the entire computing cluster hosting the DAQ software,
and the accommodation of a new camera on the large 28m H.E.S.S. telescope. We
discuss the performance of the upgraded DAQ and the lessons learned from these
activities.
