What Can You Do With All This?
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1 NFNN2, 20th-21st June 2005 National e-science Centre, Edinburgh What Can You Do With All This? One Use Case Clive Davenhall (NeSC)
2 Slide: 2 Virtual Observatory Astronomy has many archives, databases and catalogues, which are: Heterogeneous, Geographically dispersed, Have their own idiosyncratic interfaces. The Virtual Observatory is a way of accessing these archives remotely from a uniform interface. Various projects to implement: NVO, AVO etc.
3 Slide: 3 Virtual Observatory Computer Networks for the AVO. Much of the document was influenced by workshop. Measured bandwidth to remote sites, within UK and overseas, using traceroute and pchar. Timed file transfers with FTP, SCP and accelerators.
4 Slide: 4 Recent and Planned Catalogues Catalogue Date Objects The HST Guide Star Catalog 1990 ~ 2 x 10 7 ROE/NRL Object Catalogue of the Southern Sky The SuperCOSMOS Southern Sky Survey 1992 ~ 5 x ~ 1 x 10 9 WFCAM 2005 ~ 1 x VISTA ~2010 ~ 1 x 10 11
5 Slide: 5 Size of Modern Archives SuperCOSMOS Sky Survey WFCAM VISTA Object catalogues ~ 1 ~10 ~ 100 Bulk (or pixel) data ~10 ~ 100 ~ 1000 All values are in Tbyte.
6 Slide: 6 WFCAM Wide Field Infra-red Camera. Survey instrument in UKIRT in Hawaii. Will survey a significant fraction of the sky. Recently started routine observations. Will continue in operation for some years.
7 Slide: 7 WFCAM Generate about 200 Gbyte/night. These data are: processed in Cambridge, archived in Edinburgh. Transferred: from Hawaii to Cambridge by courier/tape, from Cambridge to Edinburgh across SuperJanet.
8 Slide: 8 WFCAM Eckhard Sutorius made a series of tweaks to improve transfer rate: moved local host to a faster part of the LAN, adjusted TCP/IP tuning parameters, experimented with FTP, SCP, Axel FTP accelerator and scripts to act as accelerators with SCP, got up to a transfer rate of ~12 Mbyte/sec, at this rate, can transfer 200 Gbyte in about 5 hours, so can keep up.
9 Slide: 9 WFCAM Optimal configuration for transfer with scp: TCP/IP parameters adjusted, SSH-1, compression level 3, blowfish encryption, an accelerator with 8 threads simulated. But these results are not generally applicable, eg. depend on mix of file sizes.
10 Slide: 10 ESLEA Exploitation of Switched Light-paths for e-science Applications. Investigate the use of switched-circuit networks and demonstrate that they offer concrete advantages in real applications. Principal Investigator: Prof. Peter Clarke (NeSC). Uses the UKLight network.
11 Slide: 11 Packet-Switched and Circuit-Switched Networks
12 Slide: 12 UKLight UK contribution to international effort to investigate and develop circuit-switched networks, 10 Gbit/sec connections from hub in London to StarLight and NetherLight, a collection of 1 Gbit/sec links from London to selected points in the UK, Provides dedicated, switched-circuit connections for approved projects, Managed by UKERNA and funded by HEFCE.
13 Slide: 13 ESLEA Sub-Projects Exploitation sub-projects: high-energy physics, evlbi, RealityGrid, E-Health. Capability development: control plane software, protocol development
14 Slide: 14 Control Plane Software software to create circuits on demand, not just done in real time, allow reservations in advance, not writing from scratch, modification of the NRS system developed by Saleem Bhatti et al. of UCL, largely a programming exercise (in Java), but much of it is informed by the basic networking material in NFNN.
15 Slide: 15 Contact Information Clive Davenhall National e-science Centre 15, South College Street, Edinburgh, EH8 9AA
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