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The Conquest file system: Better performance through a disk/persistent-RAM hybrid design

Authors:

An-I Andy Wang,

Geoff Kuenning,

Peter Reiher,

Gerald PopekAuthors Info & Claims

ACM Transactions on Storage (TOS), Volume 2, Issue 3

Pages 309 - 348

https://doi.org/10.1145/1168910.1168914

Published: 01 August 2006 Publication History

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Abstract

Modern file systems assume the use of disk, a system-wide performance bottleneck for over a decade. Current disk caching and RAM file systems either impose high overhead to access memory content or fail to provide mechanisms to achieve data persistence across reboots.The Conquest file system is based on the observation that memory is becoming inexpensive, which enables all file system services to be delivered from memory, except for providing large storage capacity. Unlike caching, Conquest uses memory with battery backup as persistent storage, and provides specialized and separate data paths to memory and disk. Therefore, the memory data path contains no disk-related complexity. The disk data path consists of optimizations only for the specialized disk usage pattern.Compared to a memory-based file system, Conquest incurs little performance overhead. Compared to several disk-based file systems, Conquest achieves 1.3x to 19x faster memory performance, and 1.4x to 2.0x faster performance when exercising both memory and disk.Conquest realizes most of the benefits of persistent RAM at a fraction of the cost of a RAM-only solution. It also demonstrates that disk-related optimizations impose high overheads for accessing memory content in a memory-rich environment.

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Wang YJia WJiang DXiong J(2023)A Survey of Non-Volatile Main Memory File SystemsJournal of Computer Science and Technology10.1007/s11390-023-1054-338:2(348-372)Online publication date: 30-Mar-2023
https://dl.acm.org/doi/10.1007/s11390-023-1054-3
Das SChen AMarinella M(2021)Beyond CMOS2021 IEEE International Roadmap for Devices and Systems Outbriefs10.1109/IRDS54852.2021.00011(01-129)Online publication date: Nov-2021
https://doi.org/10.1109/IRDS54852.2021.00011
Nicolae BRiteau PZhen ZKeahey K(2019)Transparent Throughput Elasticity for Modern Cloud StorageApplying Integration Techniques and Methods in Distributed Systems and Technologies10.4018/978-1-5225-8295-3.ch007(156-191)Online publication date: 2019
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Index Terms

The Conquest file system: Better performance through a disk/persistent-RAM hybrid design
1. General and reference
  1. Cross-computing tools and techniques
    1. Measurement
2. Information systems
  1. Data management systems
    1. Data structures
      1. Data access methods
  2. Information storage systems
    1. Record storage systems
      1. Directory structures
    2. Storage management
      1. Hierarchical storage management

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Reviews

Reviewer: Suma Adabala

As dynamic random access memory (DRAM) gets cheaper, larger memories are typically used as buffers to hide input/output (I/O) latency to disk. The Conquest file system is a novel approach for the more effective use of cheap DRAM. It is designed so that battery-backed DRAM serves as a persistent store for small files and file system services, while the slower disks serve as a store for large files. Rather than adapting existing file system solutions, as in the case of random access memory (RAM) file systems or RAM-based disk emulators, the authors make a case for the need to redesign a file system optimized for persistent RAMs. The Conquest file system has a simpler datapath to small files and metadata in memory that bypasses the I/O buffer and disk management found in conventional disk-based file systems. The performance evaluation of Conquest shows up to a 19-times improvement in memory performance compared to file systems designed for disks, supporting the need for file system redesign to better exploit memory performance. Based on a variety of prior studies of file access patterns and file size distribution, the strategy for delegating files to a storage medium has a filesize threshold. Files with sizes below the threshold are delegated to persistent RAM, while those larger than the threshold are stored on disk. The performance gain achieved with Conquest for workloads that exercise both disk and memory supports this simple design decision. The large file layout on disk is optimized for sequential rather than random access, making Conquest disk access optimal for multimedia files, a significant component of current and future workloads. An implementation of Conquest as a loadable module in the Linux 2.4.2 kernel is available; however, due to issues such as lower reliability and lack of a garbage collector implementation, persistent DRAM must be cost-effective before it can be deployed. This paper is definitely worth reading for operating system designers. It demonstrates a successful redesign of a system component, the Conquest file system, after re-evaluating underlying assumptions, namely, file system optimizations for disks, in the context of changes to the system organization, namely, a memory-rich storage hierarchy. Online Computing Reviews Service

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ACM Transactions on Storage Volume 2, Issue 3

August 2006

149 pages

ISSN:1553-3077

EISSN:1553-3093

DOI:10.1145/1168910

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