Paper Abstract and Keywords |
Presentation |
2018-03-01 10:50
Remote replication for LHD's large data
-- 4 Gbps data transfer of 145 TB data using MMCFTP and piplelined replication -- Kenjiro Yamanaka (SOKENDAI/NII), Hideya Nakanishi (NIFS), Takahisa Ozeki (QST), Shunji ABE, Shigeo Urushidani (SOKENDAI/NII), Takashi Yamamoto, Masahiko Emoto, Noriyoshi Nakajima (NIFS) NS2017-180 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Large volumes of data shared internationally in advanced research projects are often composed of many small files. Transfer efficiency is low when file transfer is performed many times while keeping a small file. Although transfer efficiency is improved when archiving and transferring files, there is a problem that it takes extra time for archiving / decompression, storage space for storing archive files is required separately. This point was also an issue in the experiment of remotely replicating measurement data of NIFS’s Large Helical Device (LHD) to the ITER remote experiment centre. Therefore, about 145 TB of data to be transferred was divided into about 13000 based on the LHD experiment number, and archiving and file transfer were pipelined. Since archive creation and transfer are done in parallel, archiving time does not affect throughput. Also, since the archive file is erased after the transfer, large storage is unnecessary. This storage requires two times the transfer speed at the same time as reading and writing, making it easier to become a bottleneck. Currently, the main constraint of high-speed replication is in storage performance, not in communication distance. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
MMCFTP / Large Helical Device (LHD) / The lot of small files (LOSF) problem / Remote replication / Pipelining / / / |
Reference Info. |
IEICE Tech. Rep., vol. 117, no. 459, NS2017-180, pp. 73-78, March 2018. |
Paper # |
NS2017-180 |
Date of Issue |
2018-02-22 (NS) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
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NS2017-180 |
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