Sundial: Fault-tolerant Clock Synchronization for Datacenters. - Yuliang Li; Gautam Kumar 001; Hema Hariharan; Hassan M. G. Wassel; Peter Hochschild; Dave Platt; Simon L. Sabato; Minlan Yu; Nandita Dukkipati; Prashant Chandra; Amin Vahdat (OSDI, 2020)