Managing network file systems in large deployments is a critical challenge facing administrators today. Network file systems are widely used, are standardized, and provide acceptable performance. These systems are designed for the least common denominator of functionality, across all deployments to enable widespread use across diverse client systems. Unfortunately, specific deployment scenarios...

In a typical file system, only the current version of a file (or directory) is available. In Wayback, a user can also access any previous version, all the way back to the file’s creation time. Versioning is done automatically at the write level: each write to the file creates a new version. Wayback implements versioning using an undo log structure, exploiting the massive space available on mode...

In a typical file system, only the current version of a file (or directory) is available. In Wayback, a user can also access any previous version, all the way back to the file’s creation time. Versioning is done automatically at the write level: each write to the file creates a new version. Wayback implements versioning using an undo log structure, exploiting the massive space available on mode...

The unprecedented scale, heterogeneity, and varied usage patterns of grids pose significant technical challenges to any underlying file system that will support them. While grids present a host of new concerns for file access, we focus on two issues: performance and usability. We discuss the Legion I/O model and interface to address the latter area. We compare Legion and Globus I/O against a ba...

There are distributed file systems that are being used in businesses and individuals but still users face various challenges and problems in using those systems. The distributed file system based on Java resolve the difficulties that were occurring in the past systems and provides various functionalities to users such as naming and transparency of files, high scalability, file replication with ...

This paper presents SiRiUS, a secure file system designed to be layered over insecure network and P2P file systems such as NFS, CIFS, OceanStore, and Yahoo! Briefcase. SiRiUS assumes the network storage is untrusted and provides its own read-write cryptographic access control for file level sharing. Key management and revocation is simple with minimal out-of-band communication. File system fres...

With cloud assistance, mobile apps can offload their resource-demanding computation tasks to the cloud. This leads to a scenario where computation tasks in the same program run concurrently on both the mobile device and the cloud. An important challenge is to ensure that the tasks are able to access and share the files on both the mobile and the cloud in a manner that is efficient, consistent, ...

The emergence of commercially-available network interface controllers (NICs) with remote direct memory access (RDMA) capability and the prospect of their tighter integration with the host memory system motivate the design of distributed systems based on an RDMA paradigm. A recent example is the Direct Access File System (DAFS). DAFS clients communicate requests to servers using lightweight Remo...

A practical problem faced by users of metacomputers and computational grids is: If my computation can move from one system to another, how can I ensure that my data will still be available to my computation? Depending on the level of software, technical, and administrative support available, a data grid or a distributed file system would be reasonable solutions. However, it is not always possib...

The access(2)/open(2) file-system race is the canonical example of a time-of-check-to-time-of-use (TOCTTOU) error in which a setuid binary checks that a user has permission to open a file prior to opening it. By changing the state of the file-system between the calls to access(2) and open(2), an attacker can cause the program to open a file to which the user does not have access. This race has ...