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共 435 条记录，以下是171-180 订阅

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Designing a true direct-access file system with DevFS 18

Designing a true direct-access file system with DevFS

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proceedings of the 16th usenix conference on file and storage technologies

作者： Sudarsun Kannan Andrea C. Arpaci-Dusseau Remzi H. Arpaci-Dusseau Yuangang Wang Jun Xu Gopinath Palani University of Wisconsin-Madison Huawei Technologies

ISBN: (纸本)9781931971423

We present DevFS, a direct-access file system embedded completely within a storage device. DevFS provides direct, concurrent access without compromising file system integrity, crash consistency, and security. A novel reverse-caching mechanism enables the usage of host memory for inactive objects, thus reducing memory load upon the device. Evaluation of an emulated DevFS prototype shows more than 2× higher I/O throughput with direct access and up to a 5× reduction in device RAM utilization.

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WAFL iron: repairing live enterprise file systems 18

WAFL iron: repairing live enterprise file systems

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proceedings of the 16th usenix conference on file and storage technologies

作者： Ram Kesavan Harendra Kumar Sushrut Bhowmik NetApp Inc. Composewell Technologies

ISBN: (纸本)9781931971423

Consistent and timely access to an arbitrarily damaged file system is an important requirement of enterpriseclass systems. Repairing file system inconsistencies is accomplished most simply when file system access is limited to the repair tool. Checking and repairing a file system while it is open for general access present unique challenges. In this paper, we explore these challenges, present our online repair tool for the NetApp® WAFL® file system, and show how it achieves the same results as offline repair even while client access is enabled. We present some implementation details and evaluate its performance. To the best of our knowledge, this publication is the first to describe a fully functional online repair tool.

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Logical synchronous replication in the Tintri VMstore file system 18

Logical synchronous replication in the Tintri VMstore file s...

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proceedings of the 16th usenix conference on file and storage technologies

作者： Gideon Glass Arjun Gopalan Dattatraya Koujalagi Abhinand Palicherla Sumedh Sakdeo Tintri Inc.

ISBN: (纸本)9781931971423

A standard feature of enterprise data storage systems is synchronous replication: updates received from clients by one storage system are replicated to a remote storage system and are only acknowledged to clients after having been stored persistently on both storage systems. Traditionally these replication schemes require configuration on a coarse granularity, e.g. on a LUN, filesystem volume, or whole-system basis. In contrast to this, we present a new architecture which operates on a fine granularity--individual files and directories. To implement this, we use a combination of novel per-file capabilities and existing techniques to solve the following problems: tracking parallel writes in flight on independent storage systems; replicating arbitrary filesystem operations; efficiently resynchronizing after a disconnect; and verifying the integrity of replicated data between two storage systems.

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Spiffy: enabling file-system aware storage applications 18

Spiffy: enabling file-system aware storage applications

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proceedings of the 16th usenix conference on file and storage technologies

作者： Kuei Sun Daniel Fryer Joseph Chu Matthew Lakier Angela Demke Brown Ashvin Goel University of Toronto

ISBN: (纸本)9781931971423

Many file-system applications such as defragmentation tools, file system checkers or data recovery tools, operate at the storage layer. Today, developers of these storage applications require detailed knowledge of the file-system format, which takes a significant amount of time to learn, often by trial and error, due to insufficient documentation or specification of the format. Furthermore, these applications perform ad-hoc processing of the file-system metadata, leading to bugs and *** propose Spiffy, an annotation language for specifying the on-disk format of a file system. file-system developers annotate the data structures of a file system, and we use these annotations to generate a library that allows identifying, parsing and traversing file-system metadata, providing support for both offline and online storage applications. this approach simplifies the development of storage applications that work across different file systems because it reduces the amount of file-system specific code that needs to be *** have written annotations for the Linux Ext4, Btrfs and F2FS file systems, and developed several applications for these file systems, including a type-specific metadata corruptor, a file system converter, and an online storage layer cache that preferentially caches files for certain users. Our experiments show that applications that use the library to access file system metadata can achieve good performance and are robust against file system corruption errors.

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High-performance transaction processing in journaling file systems 18

High-performance transaction processing in journaling file s...

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proceedings of the 16th usenix conference on file and storage technologies

作者： Yongseok Son Sunggon Kim Heon Young Yeom Hyuck Han Seoul National University Dongduk Women's University

ISBN: (纸本)9781931971423

Journaling file systems provide crash-consistency to applications by keeping track of uncommitted changes in the journal area (journaling) and writing committed changes to their original area at a certain point (check-pointing). they generally use coarse-grained locking to access shared data structures and perform I/O operations by a single thread. For these reasons, journaling file systems often face the problem of lock contention and underutilization of I/O bandwidth on multi-cores with high-performance storage. To address these issues, we design journaling and checkpointing schemes that enable concurrent updates on data structures and parallelize I/O operations. We implement our schemes in EXT4/JBD2 and evaluate them on a 72-core machine with a high-performance NVMe SSD. the experimental results show that our optimized file system improves the performance by up to about 2.2× and 1.5× compared to the existing EXT4 file system and a recent scalable file system, respectively.

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Protocol-aware recovery for consensus-based storage 18

Protocol-aware recovery for consensus-based storage

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proceedings of the 16th usenix conference on file and storage technologies

作者： Ramnatthan Alagappan Aishwarya Ganesan Eric Lee Aws Albarghouthi Vijay Chidambaram Andrea C. Arpaci-Dusseau Remzi H. Arpaci-Dusseau University of Wisconsin-Madison University of Texas at Austin

ISBN: (纸本)9781931971423

We introduce protocol-aware recovery (PAR), a new approach that exploits protocol-specific knowledge to correctly recover from storage faults in distributed systems. We demonstrate the efficacy of PAR through the design and implementation of corruption-tolerant replication (CTRL), a PAR mechanism specific to replicated state machine (RSM) systems. We experimentally show that the CTRL versions of two systems, LogCabin and ZooKeeper, safely recover from storage faults and provide high availability, while the unmodified versions can lose data or become unavailable. We also show that the CTRL versions have little performance overhead.

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FStream: managing flash streams in the file system 18

FStream: managing flash streams in the file system

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proceedings of the 16th usenix conference on file and storage technologies

作者： Eunhee Rho Kanchan Joshi Seung-Uk Shin Nitesh Jagadeesh Shetty Joo-Young Hwang Sangyeun Cho Daniel DG Lee Jaeheon Jeong Samsung Electronics Co. Ltd.

ISBN: (纸本)9781931971423

the performance and lifespan of a solid-state drive (SSD) depend not only on the current input workload but also on its internal media fragmentation formed over time, as stale data are spread over a wide range of physical space in an SSD. the recently proposed streams gives a means for the host system to control how data are placed on the physical media (abstracted by a stream) and effectively reduce the media fragmentation. this work proposes FStream, a file system approach to taking advantage of this facility. FStream extracts streams at the file system level and avoids complex application level data mapping to streams. Experimental results show that FStream enhances the filebench performance by 5%-35% and reduces WAF (Write Amplification Factor) by 7%-46%. For a NoSQL database benchmark, performance is improved by up to 38% and WAF is reduced by up to 81%.

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Barrier-enabled IO stack for flash storage 18

Barrier-enabled IO stack for flash storage

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proceedings of the 16th usenix conference on file and storage technologies

作者： Youjip Won Jaemin Jung Gyeongyeol Choi Joontaek Oh Seongbae Son Jooyoung Hwang Sangyeun Cho Hanyang University Texas A&M University Samsung Electronics

ISBN: (纸本)9781931971423

this work is dedicated to eliminating the overhead required for guaranteeing the storage order in the modern IO stack. the existing block device adopts a prohibitively expensive approach in ensuring the storage order among write requests: interleaving the write requests with Transfer-and-Flush. Exploiting the cache barrier command for Flash storage, we overhaul the IO scheduler, the dispatch module, and the filesystem so that these layers are orchestrated to preserve the ordering condition imposed by the application with which the associated data blocks are made durable. the key ingredients of Barrier-Enabled IO stack are Epoch-based IO scheduling, Order-Preserving Dispatch, and Dual-Mode Journaling. Barrier-enabled IO stack can control the storage order without Transfer-and-Flush overhead. We implement the barrier-enabled IO stack in server as well as in mobile platforms. SQLite performance increases by 270% and 75%, in server and in smartphone, respectively. In a server storage, BarrierFS brings as much as by 43x and by 73x performance gain in MySQL and SQLite, respectively, against EXT4 via relaxing the durability of a transaction.

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Towards robust file system checkers 18

Towards robust file system checkers

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proceedings of the 16th usenix conference on file and storage technologies

作者： Om Rameshwar Gatla Muhammad Hameed Mai Zheng Viacheslav Dubeyko Adam Manzanares Filip Blagojevic Cyril Guyot Robert Mateescu New Mexico State University Western Digital Research

ISBN: (纸本)9781931971423

file systems may become corrupted for many reasons despite various protection techniques. therefore, most file systems come with a checker to recover the file system to a consistent state. However, existing checkers are commonly assumed to be able to complete the repair without interruption, which may not be true in *** this work, we demonstrate via fault injection experiments that checkers of widely used file systems may leave the file system in an uncorrectable state if the repair procedure is interrupted unexpectedly. To address the problem, we first fix the ordering issue in the undo logging of e2fsck, and then build a general logging library (i.e., rfsck-lib) for strengthening checkers. To demonstrate the practicality, we integrate rfsck-lib with existing checkers and create two new checkers: (1) rfsck-ext, a robust checker for Ext-family file systems, and (2) rfsck-xfs, a robust checker for XFS file system, both of which require only tens of lines of modification to the original versions. Both rfsck-ext and rfsck-xfs are resilient to faults in our experiments. Also, both checkers incur reasonable performance overhead (i.e., up to 12%) comparing to the original unreliable versions. Moreover, rfsck-ext outperforms the patched e2fsck by up to nine times while achieving the same level of robustness.

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Fail-slow at scale: evidence of hardware performance faults in large production systems 18

Fail-slow at scale: evidence of hardware performance faults ...

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proceedings of the 16th usenix conference on file and storage technologies

作者： Haryadi S. Gunawi Riza O. Suminto Russell Sears Casey Golliher Swaminathan Sundararaman Xing Lin Tim Emami Weiguang Sheng Nematollah Bidokhti Caitie McCaffrey Gary Grider Parks M. Fields Kevin Harms Robert B. Ross Andree Jacobson Robert Ricci Kirk Webb Peter Alvaro H. Birali Runesha Mingzhe Hao Huaicheng Li University of Chicago Pure Storage Parallel Machines NetApp Huawei Twitter Los Alamos National Laboratory Argonne National Laboratory New Mexico Consortium University of Utah University of California Santa Cruz UChicago Research Computing Center

ISBN: (纸本)9781931971423

Fail-slow hardware is an under-studied failure mode. We present a study of 101 reports of fail-slow hardware incidents, collected from large-scale cluster deployments in 12 institutions. We show that all hardware types such as disk, SSD, CPU, memory and network components can exhibit performance faults. We made several important observations such as faults convert from one form to another, the cascading root causes and impacts can be long, and fail-slow faults can have varying symptoms. From this study, we make suggestions to vendors, operators, and systems designers.

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