Edinburgh Glasgow DL. Newcastle. Belfast. Manchester. Cambridge. Oxford RL. Hinxton. Cardiff. London. Soton. GridCast UK-Japan N+N October

Transcription

1 Edinburgh Glasgow DL Newcastle Belfast Manchester Cardiff Oxford RL Soton London Cambridge Hinxton GridCast UK-Japan N+N October

2 GridCast Using the Grid in Broadcast Infrastructures Ron Perrott BBC Queen s University, Belfast {r.perrott@qub.ac.uk} Belfast e-science Centre British Telecom GridCast UK-Japan N+N October

3 The Grid Scenario: The BBC Nations BBC NI, BBC Scotland and BBC Wales BBC Nations provide customised services in each nation Television programmes are distributed to BBC Nations from BBC Network (London) using dedicated leased ATM circuits. GridCast UK-Japan N+N October

4 Grid Infrastructure Technical High-bandwidth network connections interconnect broadcast locations. Network bandwidth means geography is less of an issue. Organisational Less centralised GridCast UK-Japan N+N October

5 Overview To develop a baseline media grid to support a broadcaster Manage distributed collections of stored media Prototype security and access mechanisms Integrate processing and technical resources Integrate with media standards and hardware To analyse Quality of Service issues Analyse remote content distribution infrastructures Analyse remote service provision To analyse reactivity, reliability and resilience issues in a grid-based broadcast infrastructure GridCast UK-Japan N+N October

6 Characteristics Stored media files are Gbytes and increasing 1 hour ~ 200 Gbytes; distributes 1 petabyte /year Management and distribution is significant technically Metadata location, timings, artists, storage formats etc. is an integral part of broadcast structure Content is a valuable commodity access, modification, copying must be controlled High levels of quality required GridCast UK-Japan N+N October

7 High level view of the Infrastructure Live Content Transmitter Cable, Satellite, internet Broadcast Output Controller BBC Scotland Glasgow BBC Scotland Schedule Controller BBC NI Belfast Network Schedule Live Content BBC NI Schedule BBC Wales Schedule Controller Controller Broadcast Output BBC Wales Cardiff BBC Network London GridCast UK-Japan N+N October

8 Broadcasting Grid Services BBC Northern Ireland Each Broadcast site is defined by its collection of available services BBC Scotland Control services Content services Local Content Controller Live Output High Bandwidth IP Network Live Output BBC Wales Network Content Controller BBC Network GridCast UK-Japan N+N October

9 A Virtualised Infrastructure BBC Scotland Sound Improvement BBC NI Image Rendering Cluster Video Editing Suite High Bandwidth IP Network Subtitling Engine BBC Wales BBC Network GridCast UK-Japan N+N October

10 Scenario A Network Schedule is defined This schedule is the framework for Nation schedules Network Schedules are distributed to BBC Nations Usually via BBC Nations formulate their schedule A Schedule is Broadcast By programming local network and content control automation GridCast UK-Japan N+N October

11 Model of Broadcast Automatic distribution of broadcast schedules Management of schedule archives Automatic notification Content is copied from archives to local content storage Content distribution defined by schedule GridCast UK-Japan N+N October

12 Broadcast grid issues Business change A revised organisational model. Services and resources Each broadcast location gains control.no network schedule. Resilience Resource sharing and no single programme repository A BBC Nation can be anywhere! Reliability Use resources available in other BBC sites or from 3 rd party suppliers Cost Better use of resources and less need for backup resources Less dependence on particular vendors or suppliers Customisation Schedule, local resources, local capabilities Interoperability Business model facilitates sharing with other broadcasters GridCast UK-Japan N+N October

13 Broadcast Schedule Services Services to control the exchange and modification of schedules Management of a distributed collections of broadcast schedules Services to deliver stored media to local sites Services to plan transport of content between sites Services to manage collections of stored media Services to distributed content to facilitate resilience Services to prepare content for broadcasting GridCast UK-Japan N+N October

14 Progress Assessment Software Development Good experience of GT3 Understanding of grid service model GT3 shifting sands has been good and bad Network Infrastructure Essential network infrastructure in place BBCNI---BeSC link in place Janet link complete soon GridCast UK-Japan N+N October

15 Model: Grid Service Operation A schedule is registered with schedule (network) management service Schedule is automatically distributed to (nation) schedule management Local controller receives notification of schedule availability Nation Controller registers (nation) schedule with local schedule management Transport services develop a transport plan for content movement Scheduled transport service moves content as defined in transport plan GridCast UK-Japan N+N October

16 Grid Service Operation Index services track grid sites and available services Discovery services locate available copies of broadcast content Services for nearest, or least busy or Discovery services identify best transport service to use Cross mounted file systems, 3 rd party or ftp-type transport. Transport services move work flows associated with content The necessary operation(s) when content is delivered GridCast UK-Japan N+N October

17 Grid Service Operation Transport planner incorporates a model of network load High cost at peak times and low cost at off-peak Other models in development Content archives are managed as replica archives Content locations are tracked.content can be withdrawn Content archives permit automatic replication For resilience and/or QoS Public and private services facilitate operation with public and private networks Co-ordinating security policies with internal BBC policies GridCast UK-Japan N+N October