Automated Recovery System Research Articles

DAQExpert the service to increase CMS data-taking efficiency

The Data Acquisition (DAQ) system of the Compact Muon Solenoid (CMS) experiment at the LHC is a complex system responsible for the data readout, event building and recording of accepted events. Its proper functioning plays a critical role in the data-taking efficiency of the CMS experiment. In order to ensure high availability and recover promptly in the event of hardware or software failure of the subsystems, an expert system, the DAQ Expert, has been developed. It aims at improving the data taking efficiency, reducing the human error in the operations and minimising the on-call expert demand. Introduced in the beginning of 2017, it assists the shift crew and the system experts in recovering from operational faults, streamlining the post mortem analysis and, at the end of Run 2, triggering fully automatic recovery without human intervention. DAQ Expert analyses the real-time monitoring data originating from the DAQ components and the high-level trigger updated every few seconds. It pinpoints data flow problems, and recovers them automatically or after given operator approval. We analyse the CMS downtime in the 2018 run focusing on what was improved with the introduction of automated recovery; present challenges and design of encoding the expert knowledge into automated recovery jobs. Furthermore, we demonstrate the web-based, ReactJS interfaces that ensure an effective cooperation between the human operators in the control room and the automated recovery system. We report on the operational experience with automated recovery.

Using assignment model as an automated recovery system

PurposeThis paper aims to deal with disaster and recovery systems, introducing the catastrophe matrix as a disaster‐preventing tool.Design/methodology/approachA new model is proposed which is proved to be a classical assignment problem. It is solved based on well‐known optimization methods. Research is presented for the danger risk of the system and a fully automated recovery system with a minimum cost is presented.FindingsResearch accepts the fact that a catastrophe has already been activated on the system.Research limitations/implicationsThe difficulty of solving the proposed model of the threat and countermeasures still remains.Originality/valueThe proposed models show a new original way to confront dangers and overcome the existing classical models based on risk management.