Pro OpenSolaris

Pro OpenSolaris A New Open Source OS for Linux Developers and Administrators

Harry J. Foxwell, PhD and Christine Tran

Pro OpenSolaris: A New Open Source OS for Linux Developers and Administrators Copyright © 2009 by Harry J. Foxwell and Christine Tran All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage or retrieval system, without the prior written permission of the copyright owner and the publisher. ISBN-13 (pbk): 978-1-4302-1891-3 ISBN-13 (electronic): 978-1-4302-1892-0 Printed and bound in the United States of America 9 8 7 6 5 4 3 2 1 Trademarked names may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, we use the names only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. Lead Editors: Michelle Lowman, Frank Pohlmann Technical Reviewer: Sam Nicholson Editorial Board: Clay Andres, Steve Anglin, Mark Beckner, Ewan Buckingham, Tony Campbell, Gary Cornell, Jonathan Gennick, Michelle Lowman, Matthew Moodie, Jeffrey Pepper, Frank Pohlmann, Ben Renow-Clarke, Dominic Shakeshaft, Matt Wade, Tom Welsh Project Manager: Kylie Johnston Copy Editor: Kim Wimpsett Associate Production Director: Kari Brooks-Copony Production Editor: Richard Ables Compositor: Diana Van Winkle, Van Winkle Design Group Proofreader: Nancy Sixsmith Indexer: Becky Hornyak Interior Designer: Diana Van Winkle, Van Winkle Design Group Cover Designer: Kurt Krames Manufacturing Director: Tom Debolski Distributed to the book trade worldwide by Springer-Verlag New York, Inc., 233 Spring Street, 6th Floor, New York, NY 10013. Phone 1-800-SPRINGER, fax 201-348-4505, e-mail kn`ano)juaop[Ln]_pe_ao[Cqe`a HAS EXTENSIVE RECOMMENDATIONS ON DEPLOYING :&3 AND THERE IS AN ACTIVE OpenSolaris ZFS community at dppl6++klajokh]neo*knc+ko+_kiiqjepu+vbo+.

C H A P T E R 6 N T H E Z F S F I LE S Y S T E M

Taking Snapshots Probably one of the most important ZFS features is its ability to create nearly unlimited and instantaneous file system snapshots, which are effectively read-only copies of a ZFS file system at a selected point in time. Such snapshots are used to enhance OpenSolaris’s boot environment management as well as to assist end users and administrators to back up and restore changeable file systems. A file system snapshot initially takes up no additional space in a pool; as the original active file system image changes, however, the snapshot grows to keep track of the changes. Creating a snapshot using the vbo command is trivially easy; just specify the full pool/file system name and a user-specified snapshot name: vbo oj]lodkp iuiennkn+dkia`eno+dbktsahh