Explore the fundamentals of MARS, an external kernel module powering 1&1 Ionos geo-redundancy, in this 44-minute conference talk from linux.conf.au 2020. Dive into MARS's working principles, its differences from DRBD, and its applications in production environments for hosting customers and mass data migration. Learn about the module's architecture, internal components, and future plans for kernel upstream integration. Gain insights into downstream SLAs, lab testing, transaction logs, and device members. Engage with the speaker during the Q&A session to deepen your understanding of this robust geo-redundancy solution.