A Persistent Snapshot Device Driver for Linux

Suresh B Siddha
Indian Institute of Science, Bangalore, India
suresh.siddha@alumnus.csa.iisc.ernet.in

K Gopinath
Indian Institute of Science, Bangalore, India
gopi@csa.iisc.ernet.in

Abstract
Introduction

Snapshots

Previous Work
Design Issues

Design of Persistent Snapshot Device Driver for a Single Node

Consistent Persistence
Log Format
Tree Structured Writable Snapshots

A Clustered Persistent Snapshot Design

Metadata Management of Snapshots
Logging
Membership updates in the Cluster
Performance

Implementation Details

Block Drivers in Linux
The Pseudo Device Driver

Problems in writing a layered device driver in Linux
Pseudocode of Driver
Snapshot Disk Layout

Changes to Linux Kernel 2.2.5

Performance
Conclusions and Future Work

Conclusions
Future Work

Acknowledgments
Bibliography
About this document ...

This paper was originally published in the Proceedings of the 5th Annual Linux Showcase & Conference, November 5–10, 2001, Oakland, CA, USA
Last changed: 22 Aug. 2003 ch

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