COSCUP 2023

Longhorn is a distributed block storage system that has been purpose-built for Kubernetes, making it an ideal cloud-native solution. As an incubating project of the Cloud Native Computing Foundation (CNCF), its main goal is to provide persistent and highly available storage for stateful workloads. In this presentation, we will be exploring Longhorn's architecture and specifically, the data path. Despite offering a wealth of features, such as snapshots, backups, and recurring jobs, there is still room for improvement in the data plane's performance. To address this, a data engine is integrated with Storage Performance Development Kit (SPDK) in the upcoming release, which improves the I/O data path, resulting in better latency and throughput. Additionally, we will introduce the Userspace Block Device Driver (ublk) as a frontend to enhance performance and reduce latency. This feature is particularly useful for edge devices that use legacy data engines.