Transcript Australia
Implementation Example Australia Geoff Molloy Communications and Computing Branch Bureau of Meteorology Australia Implementation Example 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) 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 • • • • • • • • • • • • • 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