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XtreemFS is an object-based, distributed file system for wide area networks.〔F. Hupfeld, T. Cortes, B. Kolbeck, E. Focht, M. Hess, J. Malo, J. Marti, J. Stender, E. Cesario. ("XtreemFS - a case for object-based storage in Grid data management" ). VLDB Workshop on Data Management in Grids. In: Proceedings of 33rd International Conference on Very Large Data Bases (VLDB) Workshops, 2007.〕 XtreemFS' outstanding feature is full (all components) and real (all failure scenarios, including network partitions) fault tolerance, while maintaining POSIX file system semantics. Fault-tolerance is achieved by using Paxos-based lease negotiation algorithms and is used to replicate files and metadata. SSL and X.509 certificates support make XtreemFS usable over public networks. XtreemFS has been under development since early 2007. A first public release was made in August 2008. XtreemFS 1.0 was released in August 2009. The 1.0 release includes support for read-only replication with failover, data center replica maps, parallel reads and writes, and a native Windows client. The 1.1 added automatic on-close replication and POSIX advisory locks. In mid-2011, release 1.3 added read/write replication for files. Version 1.4 underwent extensive testing and is considered production-quality. An improved Hadoop integration and support for SSDs was added in version 1.5. XtreemFS is funded by the European Commission's IST programme. The original XtreemFS team founded (Quobyte ) Inc. in 2013. Quobyte offers a professional storage system as a commercial product. ==Features== * Secure connections to Contrail (software) * Clients for Linux, Windows and OS X * Open source (New BSD License since release 1.3) * Cross-site file replication with auto-failover * Partial replicas, objects fetched on demand * POSIX compatibility * Plugins for authentication policies, replica selection * RAID0 (striping) with parallel I/O over stripes〔J. Stender, B. Kolbeck, F. Hupfeld, E. Cesario, E. Focht, M. Hess, J. Malo, J. Marti. ("Striping without Sacrifices: Maintaining POSIX Semantics in a Parallel File System" ). 1st USENIX Workshop on Large-Scale Computing (LASCO '08), Boston, 2008〕 * Read-only replication * Security (SSL, X.509 certificates) * Servers for Linux and Solaris. * experimental file system driver for Hadoop (added in version 1.2) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「XtreemFS」の詳細全文を読む スポンサード リンク
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