Mass Storage

The NCCS runs the SGI Data Migration Facility (DMF) to manage long-term archived data. The archive service is run across a number of SGI servers: DMF servers, Network File System (NFS) edge-servers, login servers (aka. dirac1 and dirac2), and parallel data movers. The user community accesses the archive through the Dirac servers or via NFS on the Discover. The Dirac servers were named in honor of the Physicist Paul Dirac who won the Nobel Prize with Erwin Schrodinger in 1933.

DIRAC (Archive) System Details

System Architecture

The Dirac (Archive) is made up of a number server systems:

  • 2 DMF servers, 4 NFS edge-servers, 2 login servers (aka. dirac1 and dirac2), and seven parallel data movers
  • SGI servers
  • 10 Gigabit Ethernet network connectivity
  • Approximately 3.4 PB of SAN attached Fibre Channel disk storage shared between the servers with SGI's Clustered XFS file system software
  • NFS access to the data portal file systems

In addition to the above system, the Dirac uses the following tape and tape library capabilities.

  • Oracle/StorageTek T10000 T2 tape drives
  • Multiple Oracle/StorageTek SL8500 storage libraries

Operating Environment

  • Operating System: Linux
  • Job Scheduler: None
  • Compilers: None
  • Analysis applications: None

External Resources