Browse > Article

A Study on Comparison of Massive Data Recording Equipments for VLBI Radio Observation Data  

Oh, Se-Jin (Radio Astronomy Division, Korea Astronomy and Space Science Institute)
Yeom, Jae-Hwan (Radio Astronomy Division, Korea Astronomy and Space Science Institute)
Roh, Duk-Gyoo (Radio Astronomy Division, Korea Astronomy and Space Science Institute)
Jung, Dong-Kyu (Radio Astronomy Division, Korea Astronomy and Space Science Institute)
Hwang, Ju-Yeon (Radio Astronomy Division, Korea Astronomy and Space Science Institute)
Oh, Chungsik (Radio Astronomy Division, Korea Astronomy and Space Science Institute)
Kim, Hyo-Ryoung (Radio Astronomy Division, Korea Astronomy and Space Science Institute)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.19, no.3, 2018 , pp. 125-132 More about this Journal
Abstract
KVN(Korean VLBI Network) introduced the Mark6 system of the MIT haystack observatory as a recorder for data recording up to 32 Gbps for VLBI(Very Long Baseline Interferometry) observation. The Mark6 recorder can record data at up to 32Gbps when two systems and 64 HDDs are installed. However, because of the unique recording method that is characteristic of Mark6, we are introducing a large amount of data into a virtual file system, or using a general RAID method, which causes data loss when reading and transferring files at the highest recording speed or file system have. The Flexbuff system, a software recorder developed by JIVE(Joint Institute for VLBI ERIC), can be configured to operate as a data recorder through RAID configuration and network upgrades. In particular, when installed in the Mark6 system, it can record VLBI data at a maximum speed of 32 Gbps with less loss of data compared to the existing Mark6 by utilizing Mark6 resources well. In this paper, we propose that the existing Mark6 system can be operated as Mark6-Flexbuff by installing jive5ab software, and it is verified through experiment that it can be effectively used for VLBI observation operation through data recording test.
Keywords
High-speed recorder; Mark6; Flexbuff; jive5ab software; Data transfer; RAID configuration;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Takahashi F., Kondo T., and Koyama Y., Very Long Baseline Interferometer, Ohmsha, 2000, pp. 35-55.
2 Thompson, A. R., Moran, J. M., and Swenson, G. W.Jr., Interferometry and Synthesis in Radio Astronomy, 2nd Ed., (New York:John Wiley & Sons), 2001, pp. 289.
3 Duk-Gyoo Roh, Se-Jin Oh, and Jae-Hwan Yeom et al., "2008 Annual Report on Korea-Japan Joint VLBI Correlator and Receiver Development," Korea Astronomy and Space Science Institute, pp. 3-100, 2008.
4 A. R. Whitney, "Mark 5 Disk-Based Gbps VLBI Data System," in New Technologies in VLBI, edited by Y. C. Minh, ASP Conference Series, Vol. 306, Astronomical Society of the Pacific, San Francisco, CA, 2003.
5 http://www.haystack.edu/tech/vlbi/mark6/index.html
6 T. Oyama et al., "The development and performance of a new 4Gbps disk recorder and eVLBI systems using a 10GbE network," 2008 General Meeting of IVS, 2008. 3.
7 Harro Verkouter, "jive5ab command set version 1.7," Joint Institute for VLBI in Europe, November 22, 2016.
8 P. de Vicente, L. Barbas, J. Gonzlez, "Using VDIF in astronomy VLBI observations at the 40m RT. Flexbuff and eVLBI operations," February 20, 2016.
9 MIT Haystack observatory, "Mark6 system user's manual," November 19, 2013.
10 Elecs Industry Co. Ltd., "RF Direct Sampler OCTAD Series," 2015.
11 Se-Jin Oh, T. Oyama, and Jae-Hwan Yeom et al.(2016, December), A Study on the Test Results and Wideband Observing of the Korean VLBI Network, Journal of The Institute of Signal Processing and Systems, 17(2), pp. 83-92.
12 http://www.vlbi.org/vdif
13 Jae-Hwan Yeom, Se-Jin Oh, Duk-Gyoo Roh et al(2009, December), Development of Software Correlator for KJJVC, Journal of Astronomy and Space Science, 26(4) pp. 567-588.   DOI