E835 Computers and Computing

E835 collaboration has two UNIX clusters.

• Online Computers (AP50: Counting Room)

  • fn835z (SGI Indigo 100MHz CPU): monitor and experiment's database server.
    • Shared Filesystems: /database, /usr/products, /usr/local, /home, /onlmon, and /scr.
    • Exabyte 8500 series Tape Drives: /dev/rmt/tps0d5.
    • SGI CD ROM player.
  • fn835y (SGI Challenge L 4X150MHz CPUs): data acquisition, filter and logger.
    • Shared Filesystems: /dump1, /dump2, /gold, and /scratch.
    • Exabyte 8500 series Tape Drives: /dev/rmt/tps0d4, /dev/rmt/tps0d5, /dev/rmt/tps0d6, /dev/rmt/tps2d1, /dev/rmt/tps2d2, /dev/rmt/tps2d3, /dev/rmt/tps2d4, /dev/rmt/tps4d1, /dev/rmt/tps4d2, /dev/rmt/tps4d3, and /dev/rmt/tps4d4.
  • fn835x (SGI Indy 133MHz CPU): run control.
    • Shared Filesystems: /dart, /proddart, /dish, /logs, /lumin, and /daqdata.
    • 2 Jorways.
  Location and layout of the online machines within the Data Acquisition racks in the AP50 E835 Counting Room. Not shown is rack 19 (to the right) for the luminosity monitor PC. The details of the first rack (rack 14) showing the SCSI connections is also available.
  The disk disk distribution is available; also in schematic format.

• Rapid Turn Around Computers (E835 Trailers PK124)

  • fn835q (DEC Alphastation 600 Model 5/266)
    • CDROM (RRD45) as /dev/rz5c.
    • Shared Filesystems: /usr/prodOSF1, /calib1q, /calib2q, /calib3q, /rta1, /rta2, /rta3, /rta7, /rta8, and /rta9.
    • Exabyte 8500 series Tape Drives: /dev/nrmt0h and /dev/nrmt1h.
  • fn835r (DEC Alphastation 600 Model 5/266): NIS slave server.
    • CDROM (RRD45) as /dev/rz5c.
    • Shared Filesystems: /usr/local, /usr/products, /calib1r, /calib2r, /calib3r, /rta4, /rta5 and /rta6.
    • Exabyte 8500 series Tape Drives: /dev/nrmt0h and /dev/nrmt1h.
  The proposed layout of peripherals. Both systems are NIS/yellow paged with the Backend Computers. User accounts of the Backend system are available via NFS mount of fn760a /usr/people filesystem. The shared filesystems are exported to the Backend Alphastations. The peripherals are shown in a schematic of the RTA and BE systems.

• Backend Computers (E835 Trailers)

  • fn760a (SGI Indigo 50MHz CPU): NIS domain master and WWW server.
    • Shared Filesystems: /usr/products; /usr/local and /usr/people.
    • Exabyte 8500 series Tape Drives: /dev/rmt/tps0d3 and /dev/rmt/tps0d4.
  • fn835c (SGI Indigo2 200MHz CPU): Northwestern (Rosen group) computer.
    • Shared Filesystems: /homec, /scratchc and /code.
    • SGI CD ROM player.
  • fn835i (DEC Alphastation 600 Model 5/266): INFN computer.
    • Shared Filesystems: /homei, /scratchi, /ntuplei, /gold1, /gold2 and /gold3.
    • CDROM (RRD45) as /dev/rz5c.
    • Exabyte 8500 series Tape Drives: /dev/nrmt0h.
  • fn835j (DEC Alphastation 250 Model 4/266): INFN computer.
    • Shared Filesystems: /homej, /scratchj and /ntuplej.
    • CDROM (RRD45) as /dev/rz4c.
    • Exabyte 8500 series Tape Drives: /dev/nrmt0h.
  • fn835k (DEC Alphastation 400 Model 4/233): Northwestern (Seth group) computer.
    • CDROM (RRD43) as /dev/rz4c.
    • Exabyte 8500 series Tape Drives: /dev/nrmt0h.
  The Alphastations mount the RTA computers for products and local files. The peripherals are shown in a schematic of the RTA and BE systems as was seen in mid 1996.

• Test Stand Computer (New Muon Lab)---No longer connected

  • fn760b (SGI Indigo 50MHz CPU)
    • Filesystem: /usr.

• Memos, Drafts and such

  • E835 Online and Offline UNIX Computing (November 22, 1994) describes the basic computing setup.
  • Presentation at February 1995 Collaboration meeting by Keith Gollwitzer.
    • Schematic of data flow from gateway dfm to tape and monitor.
    • Expected online rates for E835 (scaled from E760).
    • Expected offline processing for E835.
  • Draft of E835 Rapid Turnaround Analysis Acquisition Plan which will become the basis on how bids are requested.
  • Update of computing systems from E835 collaboration meeting June, 1996.
  • The setup is still changing...someday another memo will be written when the final set of computers exist.

• Other Information

  • How to get an account on E835 computers.
  • Some hints for working on UNIX machines. FNAL Computing Division does provide via WWW online UNIX help.
  • "UNIX at Fermilab" document on WWW.
  • The VMS Migration Task Force has some very useful information including a VMS to UNIX translation table.
  • Internet extensions to the computers: fnal.gov
  • Managed by Keith Gollwitzer.

Fermilab statements/messages/remarks/support of UNIX.

• Phasing out of VMS and switching to UNIX.
  • Statement of Direction for Operating System and Platform Support at Fermilab.
  • Remarks on the Statement of Direction.
  • First VMS Migration Task Force Formed.

• The FNAL Computing Division WWW pages dedicated to VMS to UNIX migration.