| Issue |
EPJ Web of Conf.
Volume 295, 2024
26th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2023)
|
|
|---|---|---|
| Article Number | 01024 | |
| Number of page(s) | 8 | |
| Section | Data and Metadata Organization, Management and Access | |
| DOI | https://doi.org/10.1051/epjconf/202429501024 | |
| Published online | 06 May 2024 | |
https://doi.org/10.1051/epjconf/202429501024
Erasure Coding XRootD Object Store
1 SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, USA
2 European Organization for Nuclear Research, Espl. des Particules 1, 1211 Meyrin, Switzerland
* Corresponding author: yangw@slac.stanford.edu
Published online: 6 May 2024
An erasure coding (EC) algorithm was implemented in XRootD client library, and an EC-enabled XRootD storage prototype was set up at SLAC for evaluation. The architecture and configuration of the prototype is almost identical to that of a traditional non-EC XRootD storage behind a firewall: a backend XRootD storage cluster in its simplest form, and an internet facing XRootD proxy. This proxy handles EC and spreads the data stripes of a file/object across several backend nodes. It also supports all functions used on a WLCG storage system: HTTP(s) and XRootD protocols, Third Party Copy, X509/VOMS/Token, etc. The cross-node EC architecture brings significant advantages in both performance and resilience: e.g. parallel data access, tolerance of downtime and hardware failure. It also pushes the preferred network-IO mode from Posix-like to object-like. This paper will describe the prototype’s architecture and its design choices, the performance in high concurrent throughputs and file/object operations, failure modes and their handling, data recovery methods, and administration.
© The Authors, published by EDP Sciences, 2024
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