Gyupin Moon  Donghyun Kang

10.5626/JOK.2025.52.9.721

storage device SSD ZnS write buffer Parallelism buffer management algorithm

Recently, there have been numerous efforts to enhance the performance and lifespan of SSDs by mapping their internal structure into zones. However, the write buffer algorithm within SSDs is still implemented in a traditional manner, which is unsuitable for SSDs with the Zoned Namespace (ZNS) interface. In this paper, we propose a new buffer management algorithm called Zone-aware Buffer (ZAB), which is designed to be compatible with the ZNS interface. ZAB divides the write buffer space into zones to minimize performance interference between them and to exploit parallelism within the SSD, thereby improving write performance. We implement ZAB based on ConfZNS, and our experiments demonstrate that ZAB improves performance by up to 4.6 times compared to systems that do not use a write buffer.