LUX-ZEPLIN (LZ) is a direct detection dark matter experiment currently operating at the Sanford Underground Research Facility (SURF) in Lead, South Dakota. The core component is a liquid xenon time projection chamber with an active mass of 7 tonnes.
To meet the performance, availability, and security requirements for the LZ DAQ, Online, Slow Control and data transfer systems located at SURF, we have developed and implemented a standalone IT infrastructure. It consists of a fully redundant 10 Gigabit network spanning underground and surface locations with hybrid virtual/physical data centers in both places. We employ virtualization, redundant firewalls, central authentication and user management, a web portal, 2-factor authentication for all remote access, VPN, fine-grained authorization and role management via a central directory, SAML identity and service providers, central configuration management, logging, monitoring, multiple relational databases, and frequent on-site and offsite backups. We exclusively use Open Source tools to provide these services.
Data is sent from SURF to the National Energy Sciences Computer Center (NERSC) in Berkeley, California which provides CPU and storage for reconstruction and analysis.
The system has been running reliably since its installation at SURF in 2019. We currently manage about 100 physical and virtual servers and almost 300 user accounts with 10-20 users online at any time.
This presentation will give an overview of the system and report on the operational experience.
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