LSST Data Movement. Kian-Tat Lim LSST Data Management System Architect FINAL DESIGN REVIEW TUCSON, AZ OCTOBER 21-25, 2013
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1 LSST Data Movement Kian-Tat Lim LSST Data Management System Architect FINAL DESIGN REVIEW TUCSON, AZ OCTOBER 21-25, 2013 Name of Meeting Location Date - Change in Slide Master 1
2 Raw Data 3.2 gigapixel camera, 18 bits per pixel 15 sec exposure, 1 sec shutter, 2 sec readout 2
3 Image Types Crosstalk-corrected and raw images Calibration images (daytime) Wavefront sensor images (4 x 16 megapixel) 3
4 Other Raw Data Telemetry/configuration/command/event database Atmospheric calibration telescope spectra 4
5 Level 1 Processing Near real-time alerts (1 minute latency) Maximum 5 sec total transfer time in budget High-speed networks enable centralized computing Data products: Calibrated exposures (10 bytes/pixel) Difference images (10 bytes/pixel) Catalogs (up to 100 MB/visit) 5
6 Level 2 Processing Annual full survey reprocessing Proposed split with CC-IN2P3, spatial division Inputs: Raw images Master calibration images Data products: Coadds (deep, best seeing, template,...) Catalogs 6
7 Data Management Sites and Centers HQ Site HQ Facility Observatory Management Science Operations Education and Public Outreach Archive Site Archive Center Alert Production Data Release Production Calibration Products Production EPO Infrastructure Long-term Storage (copy 2) Data Access Center Data Access and User Services French Site Processing Center Data Release Production (proposed) Base Site Base Facility Long-term storage (copy 1) Data Access Center Data Access and User Services Summit Site Summit Facility Telescope and Camera Data Acquisition Crosstalk Correction Document LDM-129 7
8 Cerro Pachon to La Serena Dedicated 100 Gbps lambda for image data Second 100 Gbps link (over same fiber) for other traffic Possible 40 Gbps diverse path Flash-based 48 hour outage buffer on summit UDP-based custom protocol for image data Multiple sources and destinations, parallel transfers Reverse flow: Quality metrics, Data Management telemetry 8
9 Time-Domain Multiplexing Crosstalk-corrected image sent first at full bandwidth to minimize latency Raw image sent second for archiving Catch-up images sent in "dead" time during exposure and/ or over secondary link 9
10 La Serena to NCSA Dedicated 40 Gbps (likely) layer 2 virtual circuit 100 Gbps possible Redundant paths via Atlantic and Pacific coasts Lossless compression of raw images measured at 42% of original for 16-bit images (2.7 GB/image), similar compressed size expected for 18-bit (but not required) 7 day outage buffer Multiple sources and destinations, parallel transfers Reverse flow: Level 1 and Level 2 data products Up to 10 PB of processed data! 10
11 TCP congestion control (work of Mike Freemon, NCSA) Slow start is bad for dedicated connections with large bandwidth-delay product Slow ramp-up Slow restart after dropped packet Disable congestion control window to maximize throughput Adjust retransmission timeout to speed transfer completion after packet loss Use Hierarchical Token Bucket to manage bandwidth allocation across multiple flows
12 NCSA to Alert Users Up to 40K alerts per visit (average 10K) Each alert is about 30 KB data + images Need >250 Mbit/sec per full feed Limited resources VOEvent brokers get full feeds Other users get filtered feeds (tens of alerts per user) 12
13 NCSA to CC-IN2P3 Raw images (4.2 PB) transferred during year (> 1 Gbit/sec) Master calibration images transferred before Data Release Production begins Boundary images, backgrounds, all-sky calibrations exchanged Verify processing using overlap region Catalogs and co-add images transferred back 13
14 NCSA to High-Volume Users Several groups expected to download most/all of each Data Release Dark Energy Science Collaboration Planetaria Bring your own bandwidth ("shipping and handling") Need to have sufficient bandwidth from disk 14
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