Vanderbilt CMS Tier 2

Vanderbilt Home
Overview of the CMS-HI Tier 2 at Vanderbilt
  • The primary computational and data storage resource for the heavy ion program in CMS.
  • Funded by the US Department of Energy, Office of Nuclear Physics.
  • Additional heavy ion computing / disk resources at the MIT Tier 2, at the Tier 2ʼs in France, Brazil, and Turkey, and using the tape archive at the Fermilab Tier 1.
  • Model of operation:
    • Raw data is processed promptly at the Tier 0 during the ~one month of data taking.
    • Raw data are archived to tape at the Tier 0 and at FNAL.
    • Raw data and prompt reco are transferred to the Vanderbilt Tier 2.
    • Analysis and re-reco passes are done at this Tier 2. The re-reco passes and raw data subscription are unique features of this Tier 2 in CMS.
  • ACCRE:
    • The ACCRE cluster is a shared resource used by more than 400 researchers from 30 campus departments and four schools.
    • The cluster currently has approximately 500 nodes and 4,400 processor cores.
    • Each node has either 3, 4, 6, or 12 GB of RAM per core.
    • Home directories and scratch space are stored on filesystems utilizing IBMʼs GPFS with a total usable capacity of 240 TB and a peak bandwidth of 6 GBytes/ second.
    • ACCRE Technical Staff include 10 support personnel with more than 60 years of combined experience.
    • ACCRE is staffed Monday - Friday from 7:30 AM - 6 PM Central with evening / weekend support for critical issues.

  • Grid Infrastructure
    • Two Compute Elements
    • Two Storage Elements
    • Seven GridFTP Servers
    • One GUMS Server
    • Two Frontier / Squid Servers
    • Thirty Storage Depots
    • Nagios is used to monitor our status on the OSG RSV Tests and the CERN SAM tests, as well as our PhEDEx transfer rates