Archiver System Management for Belle II Detector Operation

The Belle II experiment is a high-energy physics experiment at the SuperKEKB electron-positron collider. Using Belle II data, high-precision measurement of rare decays and CP-violation in heavy quarks and leptons will be performed to probe new physics beyond the standard model. In this article, we present the archiver system used to store the monitoring data of the Belle II detector and discuss in particular how we manage the operation of this system. We currently record about 23 000 variables including the operation conditions of various components of subdetectors, status of data acquisition, and luminosity information of the colliding beams. For stable data taking, it is essential to collect and archive these variables. We ensure that all the variables from the subdetectors and other systems, as well as the status of the archiver itself, are available, consistent, and regularly updated. To deal with a possible hardware failure, we prepared a backup archiver that is synchronized with the main archiver. The archiver has been successfully running over the Belle II operation period.