The article introduces TernFS, an open-source, exabyte-scale distributed filesystem developed by XTX Markets to meet the growing storage demands of their algorithmic trading operations. It highlights TernFS's architecture, capabilities, and advantages, such as support for massive scalability, redundancy, and hardware agnosticism, while also noting some limitations like immutability of files and constraints on small file handling. The filesystem has been successfully deployed, serving multiple terabytes per second without data loss.