• 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