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ACM Transactions on Storage (TOS), Volume 9 Issue 3, August 2013

SCMFS: A File System for Storage Class Memory and its Extensions
Xiaojian Wu, Sheng Qiu, A. L. Narasimha Reddy
Article No.: 7
DOI: 10.1145/2501620.2501621

Modern computer systems have been built around the assumption that persistent storage is accessed via a slow, block-based interface. However, emerging nonvolatile memory technologies (sometimes referred to as storage class memory (SCM)), are...

Dynamic Synchronous/Asynchronous Replication
Assaf Natanzon, Eitan Bachmat
Article No.: 8
DOI: 10.1145/2508011

Online, remote, data replication is critical for today’s enterprise IT organization. Availability of data is key to the success of the organization. A few hours of downtime can cost from thousands to millions of dollars With increasing...

BTRFS: The Linux B-Tree Filesystem
Ohad Rodeh, Josef Bacik, Chris Mason
Article No.: 9
DOI: 10.1145/2501620.2501623

BTRFS is a Linux filesystem that has been adopted as the default filesystem in some popular versions of Linux. It is based on copy-on-write, allowing for efficient snapshots and clones. It uses B-trees as its main on-disk data structure. The...

A Prefetching Scheme Exploiting both Data Layout and Access History on Disk
Song Jiang, Xiaoning Ding, Yuehai Xu, Kei Davis
Article No.: 10
DOI: 10.1145/2508010

Prefetching is an important technique for improving effective hard disk performance. A prefetcher seeks to accurately predict which data will be requested and load it ahead of the arrival of the corresponding requests. Current disk prefetch...