| Autor: |
Nakanishi, Hideya, Kojima, Mamoru, OHSUNA, Masaki, NONOMURA, Miki, IMAZU, Setsuo, NAGAYAMA, Yoshio, Hideya, NAKANISHI, Mamoru, KOJIMA, Masaki, OHSUNA, Miki, NONOMURA, Setsuo, IMAZU, Yoshio, NAGAYAMA |
| Jazyk: |
angličtina |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
Journal of Plasma and Fusion Research SERIES = Journal of Plasma and Fusion Research SERIES. 7:361 |
| Popis: |
At the end of LHD experimental campaign in 2003, the amount of whole plasma diagnostics raw data had reached 3.16 GB in a long-pulse experiment. This is a new world record in fusion plasma experiments, far beyond the previous value of 1.5 GB/shot. The total size of the LHD diagnostic data is about 21.6 TB for the whole six years of experiments, and it continues to grow at an increasing rate. The LHD diagnostic database and storage system, i.e. the LABCOM system, has a completely distributed architecture to be sufficiently flexible and easily expandable to maintain integrity of the total amount of data. It has three categories of the storage layer: OODBMS volumes in data acquisition servers, RAID servers, and mass storage systems, such as MO jukeboxes and DVD-R changers. These are equally accessible through the network. By data migration between them, they can be considered a virtual OODB extension area. Their data contents have been listed in a “facilitator” PostgreSQL RDBMS, which now contains about 6.2 million entries, and informs the optimized priority to clients requesting data. Using the “glib” compression for all of the binary data and applying the three-tier application model for the OODB data transfer/retrieval, an optimized OODB read-out rate of 1.7 MB/s and effective client access speed of 3?25 MB/s have been achieved. As a result, the LABCOM data system has succeeded in combination of the use of RDBMS, OODBMS, RAID, and MSS to enable a virtual and always expandable storage volume, simultaneously with rapid data access. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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