Development of integrated Analysis System for Space and Astronomical Science combined with Mass Database

1.远程站点间数据共享的技术评价我们比较了远程站点间文件共享的各种方法。虽然SRFS （Shared Rapid File System）可以有效地传输大量数据并保证数据的一致性，但当数据量很小时，性能会下降。NFS在小数据传输方面表现出更好的效果。虽然NFS不能保证数据的一致性，但我们发现可以避免ISAS（空间与航天科学研究所）提供的文件的不一致性。源自GRID的数据共享方法似乎与ISAS.2中使用的分析软件不兼容。集成分析环境我们使用NFS结合SAN上的快速文件共享构建了数据分析网络系统（DANS）。我们与日本国家天文台（NAOJ）合作，实现ISAS数据库与NAOJ数据库的互联互通。我们与NAOJ的SMOKA团队合作开发了jMAISON（基于java的多波长天文图像在线服务）。jMAISON是一个中间代理服务，用于WWW上的用户和多个远程天文数据（图像和目录）服务器。在常用框架的基础上对数据归档与传输系统（DARTS）进行了重构，并开发了虚拟天文台（VO）接口，该接口是天文数据服务的国际标准。我们估计了一个分布在ISAS和NAOJ的数据处理环境。我们发现使用NFS在ISAS和NAOJ之间以300Mbps或更高的速率传输文件对于常用的个人计算机是可能的。我们构建了一个集成的分析环境，提供了各种工具以及一系列空间和天文科学数据。几台计算机不仅是ISAS，而且在外部机构共享环境。该系统降低了管理成本，提高了工作效率。

1.Technical evaluation of data sharing among remote sitesWe compared various file sharing methods which can be used among remote sites. While SRFS (Shared Rapid File System) efficiently transfers mass data and guarantees the coherency of the data, the performance degrades when the data are so small. NFS shows better results for small data transfer. Though NFS does not guarantee the coherency of data, we found it possible to avoid the incoherency as for the files ISAS (Institute of Space and Astronautical Science) provides. Data sharing methods derived from GRID seems incompatible with analysis software used here in ISAS.2.Integrated Analysis EnvironmentWe constructed the Data Analysis Network System (DANS) using NFS in conjunction with rapid file sharing over SAN. We cooperate with National Astronomical Observatory Japan (NAOJ) to connect databases in ISAS and ones in NAOJ each other. We developed jMAISON (Java-based Multi-wavelength Astronomical Image Service ON-line) in collaboration with SMOKA team in NAOJ. jMAISON is an intermediate broker service for users and multiple remote-astronomical data (images and catalogs) servers on WWW.We rebuilt Data Archive and Transfer System (DARTS) on the basis of commonly used framework, and developed an interface for Virtual Observatory (VO), which is an international standard for astronomical data services.We estimated a data processing environment which will be distributed in ISAS and NAOJ. We found it possible to transfer files between ISAS and NAOJ at the rate of 300Mbps or more using NFS with commonly used personal computers.We constructed an integrated environment for analysis, which provides various tools together with a series of space and astronomical science data. Several computers not only is ISAS but also at external institutes share the environment. This system decreases a management cost, and improves a working efficiency.