Jun Zeng focused on improving reliability in the daos-stack/daos repository by addressing a critical bug in VOS pool recreation state handling during faulty device replacement. Using C programming and system programming skills, Jun differentiated between pool recreation and initial pool creation, ensuring that pool state flags were set correctly when devices were replaced. This technical approach reduced the risk of incorrect state propagation and minimized operational downtime during hot-swaps and fault scenarios. The work demonstrated a deep understanding of storage systems and contributed to more robust pool state management, enhancing the overall stability of device replacement workflows within the DAOS project.