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Geoff Molloy. Communications and Computing Branch Bureau of Meteorology Australia. Servers. ·        UNIX based Message Switching System ·        Currently ported to HP, IBM and Linux machines. Use HP and IBM internally Runs in 8 BOM offices (2 in Melbourne). Failover.

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Geoff Molloy

Communications and Computing Branch

Bureau of Meteorology

Australia


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Servers

  • ·       UNIX based Message Switching System

  • ·       Currently ported to HP, IBM and Linux machines. Use HP and IBM internally

  • Runs in 8 BOM offices (2 in Melbourne)


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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:

  • heart-beats are exchanged between the servers via the LAN and via a direct link.

  • If the primary fails then the backup acquires the operational disks (which are always connected to both machines)

  • The backup also takes over the operational IP address.

  • The entire process takes 1-2 minutes.

  • This process ensures that other GTS centres only ever need to connect to one IP address.


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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


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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.


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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


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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.


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International Links

  • 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)



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