Marine Ecosystems Research Department - jamstec japan agency ...

Japan Marine Science and Technology Center
Computer and Information Service
Computer network management
(1) Computer systems
(a) Supercomputer system
Understanding the various ocean phenomena
through mathematical analysis and forecasting change
through numerical models are pivotal to gaining a clear
scientific grasp of global environmental issues. This
requires the power of a supercomputer. JAMSTEC
began using a supercomputer the SX-/ system
on March , , and replaced it with the
supercomputer SC system in September . This
SC system is a -node SMP server using scalar
processors. Peripheral devices include hard disk units
connected by fiber channels, and a tape archival
system expandable to TB. The system also
features a vector-type high-speed computation server
to operate existing applications. The SC system has
been being used in explaining various ocean phenomena
and predicting change through numerical modeling,
and science and technology computation and data
processing in reflection seismic surveys, genome
analysis, and research and development projects.
(b) Shared computer systems
JAMSTEC has been operating the following shared
computer systems: AlphaServer with VMS operating
system, AlphaServer DSE with Digital UNIX
operating system for use in data transfer to the supercomputer
and small-scale computation, and the SGI
ONYX for image analysis and processing.
(2) Networks
(a) JAMSTEC network
The JAMSTEC network connects the Yokohama
Institute for Earth Sciences and the other major
centers with the necessary bandwidth for data
exchange and communication. In fiscal a local
area network based on FDDI was established at the
Yokosuka Headquarters, and in fiscal the base
was upgraded from FDDI to Gigabit Ethernet. The
networks within the Yokohama Institute for Earth
Sciences, Mutsu Institute for Oceanography, and
GODAC comprise Gigabit Ethernet base LAN and
Fast Ethernet branch lines.
Figure shows the network connection between
JAMSTEC Headquarters and the research institutes.
Mutsu Institute for Oceanography and the Tokyo Branch
are connected to Yokohama Institute for Earth Sciences
by a Mbps wide-area LAN line. Yokohama Institute for
Earth Sciences is connected to Yokosuka Headquarters
by a Mbps ATM line, and GODAC in Okinawa is
connected by the JGN (Japan Gigabit Network).
(b) Internet
Since JAMSTEC first established its presence on
the internet with a kbps connection in , the
speed of the connection has increased with the rise in
traffic. In fiscal JAMSTEC connected to SINET
by a Mbps leased line. Internet connection was initially
from Yokosuka Headquarters, but today it is
from Yokohama Institute for Earth Sciences.
GODAC was connected to the internet by leased
line in fiscal . The introduction of this high-speed
link has enabled the effective use of image and video
data, both of which require large bandwidth.
(c) Security
JAMSTEC installed a network firewall in fiscal ,
and has continued to upgrade this as required to ensure
the security of all network computers. Moreover, security
monitoring through an intrusion detection system, regular
SINET
Science
Information
Network
IARC
IPRC
100Mbps
3Mbps
3Mbps
100Mbps
6Mbpsvia Japan Gigabit Network
Fig. 3 JAMSTEC network
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