Rironseppyou Network (Rironnet)

General information

  • The Rironseppyou Network (Rironnet) is the Linux network operated by the Glacier and Ice Sheet Research Group at the Institute of Low Temperature Science, Hokkaido University.
  • The central server is the computer wwwice, which distributes the users (via NIS = Network Information Service), the home directories (via NFS = Network File System) and the websites (via the Apache web server).
  • The home directories are located at /uchi/<username> (= /home/<username>/mnthome). In addition, each user can use work directories such as /work/earth1/<username> etc.

Computing equipment

Model Name (1) Room OS CPU RAM HD Exported directories
Dell Precision 7920 trillian 306 OpenSUSE Leap 15.4 12-Core Intel Xeon Gold 6256,
3.6 GHz (4.5 GHz Turbo)
64 GB 4 x 2 TB SATA /work/trillian1 (1.8 TB)
/work/trillian2 (1.6 TB)
/work/trillian3 (1.4 TB)
Dell Precision 7910 earth 307 OpenSUSE Leap 15.4 2 x 14-Core Intel Xeon E5-2690 v4,
2.6 GHz
128 GB 4 x 2 TB SATA /work/earth1 (1 TB)
/work/earth2 (1 TB)
/work/earth3 (1 TB)
/work/earth5 (1 TB)
/work/earth6 (1 TB)
/work/earth7 (1 TB)
/work/earth9 (1.1 TB)
Dell Precision 7610 deepthought 306 OpenSUSE Leap 15.4 12-Core Intel Xeon E5-2697 v2,
2.7 GHz
128 GB 2 x 1 TB SATA /work/deepthought9 (350 GB)
Dell Optiplex 990 eddie 306 OpenSUSE Leap 15.4 Quad-Core Intel Core i5-2400,
3.1 GHz
8 GB 1 x 1 TB SATA ---
Dell OptiPlex 7040 wwwice (server) 306 OpenSUSE Leap 15.4 Quad-Core Intel Core i5-6500,
3.2 GHz
8 GB 2 x 2 TB SATA /uchi
(home directories)

(1) Full name: <name>.lowtem.hokudai.ac.jp


  • A backup of all home directories /uchi/<username> (= /home/<username>/mnthome) is written every night on the external hard disk of the computer wwwice.
  • No backups of the work directories (/work/earth1/<username> etc.) are made.

Rules and hints

  • It is your own responsibility to make regular backups of your personal data
       (on memory stick, portable hard disk, DVD or CD).
          Do not rely fully on the automatic backup of the home directories.
  • Do not eat or drink in the PC room 306, and keep it clean.
  • If you end a working session, please log out and switch off the monitor, but do not switch off the computer.
  • Do not use the server wwwice for regular work.
  • Large data files must not be kept in the home directories /uchi/<username> (= /home/<username>/mnthome).
       Please use one of the work directories instead.
  • All users must be subscribed to the Rironnet mailing list in order to get security-relevant information etc.
  • If there are any problems, please contact
       Ralf Greve <greve@xxx> or Shin Sugiyama <sugishin@xxx> (xxx = lowtem.hokudai.ac.jp).


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Last modified: 2022-09-13 by Ralf Greve