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– High-throughput Gateways:
Achieving 100Gb/s
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data rates with XRootD - Preparing for
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HL-HLC and SKA
To address the needs of forthcoming projects such as the Square Kilometre Array (SKA) and the HL-LHC, there is a critical demand for data transfer nodes (DTNs) capable of achieving 100Gb/s of data movement. This high throughput can be attained through combinations of increased concurrency of transfers or by optimising and improvements in the speed of individual transfers. At the Rutherford Appleton Laboratory (RAL), the UK's Tier-1 centre for the Worldwide LHC Computing Grid, and initial site for the UK SKA Regional Centre (SRC), we have provisioned 100GbE XRootD servers in preparation for SKA operations. This presentation details the efforts undertaken to reach 100Gb/s data ingress and egress rates using the WebDAV protocol through XRootD endpoints, including the testing using use of a novel XRootD plug-in designed to asses XRootD performance independently of physical storage backend. The effects of tuning inside XRootD, and also Results are presented for transfer tests against a CephFS storage backend under different configuration settings (e.g. via tunings to file layout tuningslayouts) are also presented. We discuss the challenges encountered, bottlenecks identified, and insights gained, along with a description of the most effective solutions developed to date and areas of future activities.
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