Transcript Australia

Implementation Example Australia
Geoff Molloy
Communications and Computing
Branch
Bureau of Meteorology
Australia
Implementation Example Australia
Servers
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UNIX based Message Switching
System
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Currently ported to HP, IBM and
Linux machines. Use HP and IBM
internally
• Runs in 8 BOM offices (2 in Melbourne)
Implementation Example Australia
Failover
• One issue is the mechanism for swapping to the backup
machine if the primary is unavailable for an upgrade or has
failed. On HP use a proprietary product called
ServiceGuard and on IBM’s use HACMP.
• Both work in the same manner:
1. heart-beats are exchanged between the servers via the LAN
and via a direct link.
2. If the primary fails then the backup acquires the
operational disks (which are always connected to both
machines)
3. The backup also takes over the operational IP address.
4. The entire process takes 1-2 minutes.
• This process ensures that other GTS centres only ever need
to connect to one IP address.
Implementation Example Australia
Data Volumes
• Currently receive about 450,000 messages
and files per day (most domestic).
• Send over 1 million messages and files.
• Have about 120 input connections in MSS
Implementation Example Australia
Web Site: www.bom.gov.au
• Is an increasingly important mechanism for
getting data to the general public but also to
specific customers.
• 10Mbps internet link
• Up to 8.5 million hits per day in severe
weather situations. Radar loops very
popular
• Data is populated from Message Switching
System
• In the process of replacing our HP UNIX
Web server with a cluster of Linux PCs.
Implementation Example Australia
Transmission mechanisms
• Still issue about 10,000 faxes per day but is
declining.
• Use a polling fax system
• Deliver voice files to a telephone weather service
• Web
• FTP via Internet (ftp.bom.gov.au)
• E-mail output
• Many links to private companies – airlines, private
met companies
• AFTN
• Emergency services
• Marine radio broadcast
Implementation Example Australia
Incoming domestic data
• A lot of AWS use the telephone network. Some have leased
lines and report every minute
• Some co-operative observers have laptop PCs and they use
the telephone network and TFTP to send messages
• Some observations received via e-mail
• Most ship reports received via satcom-C and the domestic
X.25 network (Austpac)
• Use ISCS (US International Satellite Communications
System)
• 64Kbps X.25 link to AFTN
• Some data received via Internet – FTP to our external FTP
Server (ftp.bom.gov.au) and retrieved by MSS (FTP get)
• Radar – about 100 radars with data received by MSS every
10 minutes. Converted to image form and stored on Web
server and sent to sleected customers.
Implementation Example Australia
International Links
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Tokyo – 64Kbps leased line (WMO sockets + FTP)
Bracknell – 128/32K Frame Relay (WMO sockets + FTP)
Washington – sockets via Tokyo link.
Singapore – 128/8K Frame Relay (WMO sockets)
Jakarta – 128/8K Frame Relay (WMO sockets)
Malaysia – Internet (WMO sockets + FTP)
India – Internet (WMO sockets)
Fiji – 9600 leased line (WMO sockets)
Noumea – 9600 leased line (X.25)
Vanuatu – Internet (non-WMO sockets + FTP)
PNG – Internet (currently receive only) FTP
Solomon Islands – Internet but currently broken
Moscow – experimental Internet link (WMO FTP)
Implementation Example Australia
Arafura Sea
Darwin
Wyndham
Gulf of
Northern Territory
Carpentaria
Indian Ocean
Coral
Sea
Cooktown
Cairns
Derby
Northern Territory
Townsville
Mount Isa
Queensland
Mackay
Queensland
Western Australia
Alice Springs
Western Australia
Rockhampton
Ayers Rock
Charleville
South Australia
Brisbane
South Australia
Geraldton
Bourke
Kalgoorlie
Broken Hill
New South Wales
Port Augusta
Perth
New South Wales
Newcastle
Adelaide
Sydney
Albany
Canberra
Victoria
Melbourne
Victoria
Indian Ocean
Tasmania
Hobart
Tasmania
Satellite Link
Casey
Implementation Example Australia
k
Brisbane
Router
Router
mail
External Connections
Firewall
Router
Router
AARNET
BoM Network
Internet
mail
Router
Router
Firewall
'
Router
External Connections
Melbourne
WEB FTP
Router
Implementation Example Australia
END