In the PESTO file system, the complete file update history is kept as a tree of file versions. It will often be desirable to give access to subsets of the file versions history without having to grant access to the entire tree. Keys on Trees is a scheme for assigning attributes to every tree node in such a way that knowledge of the attribute of one node makes it possible to calculate the attrib...

Traditional network file systems, like NFS, do not extend to wide-area due to low bandwidth, high network latency, and dynamism introduced in the WAN environment. Metadata access latency is a significant performance problem for Wide Area File Systems, since metadata requests constitute a large portion of all file system requests, are synchronous, and cannot be cached at clients. We present Wire...

File systems that manage magnetic disks have long recognized the importance of sequential allocation and large transfer sizes for file data. Fast random access has dominated metadata lookup data structures with increasing use of B-trees on-disk. Yet our experiments with workloads dominated by metadata and small file access indicate that even sophisticated local disk file systems like Ext4, XFS ...

Document images can be stored compactly using JBIG. The main drawback of the method is the lack of direct access to the compressed image file (spatial access). Here we propose a storage system based on JBIG so that spatial access is also supported. For facsimile images, the increase in the file size is only about 10 %. With this cost we achieve also a fast preview to the image using only about ...

The Panasas file system uses parallel and redundant access to object storage devices (OSDs), per-file RAID, distributed metadata management, consistent client caching, file locking services, and internal cluster management to provide a scalable, fault tolerant, high performance distributed file system. The clustered design of the storage system and the use of clientdriven RAID provide scalable ...

We describe our work in implementing a wide-area distributed file system for the NSF TeraGrid. The system, called XUFS, allows private distributed name spaces to be created for transparent access to personal files across over 9000 computer nodes. XUFS builds on many principles from prior distributed file systems research, but extends key design goals to support the workflow of computational sci...

Abstract Non-functional properties of IO-streams are typically not specified and passed to the used middleware or operating system. Knowing such as expected access pattern, reliability, visibility for data would allow a better storage resource selection by infrastructure thus could improve overall performance. With pragma annotations, we let developers declare intended their file descriptors au...

Popular files could exhaust the capacity of the file owner node, leading to low efficiency in P2P file sharing systems. File replication is an effective method to deal with this problem by distributing load over replica nodes. Recently, numerous file replication methods have been proposed for P2P content delivery networks on the Internet. However, due to mobility and resource constraints in the...

FILETELLER is a credential-based network file storage system with provisions for paying for file storage and getting paid when others access files. Users get access to arbitrary amounts of storage anywhere in the network, and use a micropayments system to pay for both the initial creation of the file and any subsequent accesses. Widescale information sharing requires that a number of issues be ...

This paper compares the vnode architecture found in SunOS with the internal file system interfaces used in the Sprite distributed file system implementation. The emphasis of the comparison is on generalized support for remote access to file system resources, which include peripheral devices and IPC communication channels as well as regular files. A strong separation of the internal naming and I...