Аннотация:Octotron is the software designed to control all abnormal states of any supercomputer component. Based on the supercomputer model approach, Octotron constantly compares various sensor values came from the supercomputer to the predefined values or patterns. In case of fault detection, Octotron triggers a reaction. Octotron was successfully evaluated on Chebyshev and Lomonosov MSU supercomputers before. The paper is devoted to the Octotron usage experience on the Lomonosov-2 supercomputer which is No.1 supercomputer in the Top50 Russian and CIS supercomputers list.