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Managing RAID on Linux: Fast, Scalable, Reliable Data Storage 1st Edition

by Derek Vadala (Author)

3.5 9 ratings

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Redundant Array of Independent Disks (RAID) technology is becoming a standard feature of computer systems that support mission-critical services like file sharing, mail exchange, or Web servers. RAID offers two benefits to these essential systems: improved I/O performance and fail-safe data storage. Although bandwidth problems on networks are well documented, the internal data transfer bottleneck that exists at the hardware level in each system can also leave you with perplexing performance issues. RAID is a cost-effective and easy-to-manage way to alleviate this bandwidth problem by distributing the I/O load seamlessly across multiple disks and controllers. RAID also provides uninterrupted data access through disk mirroring and parity algorithms. That means systems can remain online even during a disk or controller failure. RAID is scalable, making it robust enough for large, high-traffic sites and small, critical systems. By using RAID, system administrators can combine single disks into terabytes worth of data storage. Managing RAID on Linux covers everything system administrators need to know to put together a system that can support RAID. You will learn about the different types of RAID, along with associated technologies and issues, and how to choose the best RAID system for your needs. With a step-by-step, hands-on approach, the author guides you through the installation of either Linux software RAID or a hardware RAID card. The book shows how to build an array and optionally install a high-performance file system. Contents include:

An introduction to RAID and Linux
Planning and architecture of your RAID system
Building a software RAID
Software RAID tools and references
Building a hardware RAID
Performance and tuning of your RAID system

RAID has become the low-cost solution of choice to deal with the ever-increasing demand for data storage space. Written for system administrators, power users, tech managers, and anyone who wants to learn about RAID technology, Managing RAID on Linux sidesteps the often-confusing vendor-specific approach you'll find elsewhere to give you the straight story on RAID. Even non-Linux users will find this book full of valuable material.

Editorial Reviews

About the Author

lives in New York City. He works for azurance.com, an open source and security consulting firm that he co-founded. He has been published in SysAdmin Magazine, Linux Journal, The Perl Journal, and The Journal of Linux Technology.

Product details

Publisher ‏ : ‎ O'Reilly Media; 1st edition (January 21, 2003)
Language ‏ : ‎ English
Paperback ‏ : ‎ 260 pages
ISBN-10 ‏ : ‎ 1565927303
ISBN-13 ‏ : ‎ 978-1565927308
Item Weight ‏ : ‎ 14.9 ounces
Dimensions ‏ : ‎ 7 x 0.58 x 9.19 inches

Best Sellers Rank: #3,960,478 in Books (See Top 100 in Books)
- #562 in Unix Operating System
- #1,025 in Computer Operating Systems (Books)
- #1,409 in Microsoft OS Guides

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3.5 9 ratings

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Derek Vadala

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Derek Vadala is the author of O'Reilly's Managing RAID on Linux. He has written for magazines including SysAdmin, The Perl Journal and Linux Journal. He lives in New York City where he works as security engineer at a major financial institution.

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3.5 out of 5

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Nick

For RAID beginners that don't want to dig too deep

Reviewed in the United States on April 26, 2003

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I was pretty diappointed by the content of that book.
The graphs and the explanations on what is RAID are nice, but there are only a few lines about what to do if something goes wrong, which is the kind of situation you would like to have a strong reference on how to save your data.
I would rate this book as ok for beginners, but when you want to know more, you don't have much help, so a bad mark for advanced users.
I expected a more advanced work like on the O'Reilly book 'Using Samba' which is very nice, especially the Troubleshooting section.

7 people found this helpful

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Murdoch

Useful, but dated

Reviewed in the United States on December 19, 2011

At the time of this review (2011) "Managing RAID on Linux" is a book that contains some very helpful information for RAID newbies but also contains much out-of-date material and perspectives. On the positive side, the book gives a good introductory overview of RAID, explaining: the fundamental issues involved (redundancy and performance); the various RAID levels and how they work; how software and hardware RAID fit into the overall Linux architecture; the basic mdadm procedures and commands; and other common issues and concerns. As promised by the title, a focus is maintained on the administrative aspects of RAID, such as planning, installation, configuration, and tuning.

Nevertheless much of the material, particularly on peripheral subjects, is outdated. The section for disk hardware focuses exclusively on SCSI and PATA technologies, with only a brief reference to SATA as an upcoming technology. At the time of writing, kernel 2.6 had not been released, and so discussions about patching and kernel options revolve around 2.0, 2.2, and 2.4. Mdadm (a software RAID management package) had just been released, so it is described and promoted in the book; however, a whole lot of material in the book is devoted to the raidtools package, which as far as I know is now defunct and obsolete. The chapter on hardware raid technologies is of course now many years out of date. The final section discussing file systems provides a perspective limited to 2002. The bulk of the discussion deals with ext2 versus ext3, along with a long promotion of reiserfs. XFS and JFS are also mentioned but only briefly, with no substantive technical discussion of their merits.

In brief, this is a well-written book and provides some useful introductory material. But if you can find a more recent, up-to-date treatise on the subject, you should buy that instead.

2 people found this helpful

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James W. Thompson

Very disappointing

Reviewed in the United States on January 11, 2003

The first 60 pages of this book read like an A+ guide to disk systems, and while that might be useful to some people, a topic like managing RAID on Linux is not the place for it. I'm guessing that if you are interested in this book you already know the difference between SCSI and IDE and really don't need someone to tell you the maximum length of an IDE cable.
While the author mentions disk failures we only get 5 short paragraphs on how to go about recovering. The rest of the book is devoted to describing the tools you can use to manage, build, and tear down arrays with equal time given to the earliest (outdated) RAID implementations. I found good and interesting data on approximately 20 of the 250 pages in this book, which means that this will probably replace sendmail as the worst O'Reilly book of all time.
What this book does really well is aggregate info that is available on the net, so if you don't have an internet connection or are too lazy to spend the two hours it would take you to google this data up, go ahead and order it

20 people found this helpful

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Alexander Bunkenburg

Fairly good summary of Linux RAID information

Reviewed in the United States on January 16, 2005

Description

Some 230 pages that read easily. The first two chapters explain what RAID and the RAID levels are, what Linux offers, and compares software to hardware implementations. The third chapter gives detailed instructions on how to build a software RAID, using mdtools or mdadm. It tells you how to build the kernel with the right options, which may be unnecessary for you. There's some history of versions of the kernel, raidtools, mdadm. Furthermore, we get detailed information about creating arrays by hand, including hybrid arrays for combining the benefits of different RAID levels. The forth chapter gives a detailed reference about mdtools and mdadm, and the /proc pseudo-files provided by Linux. The fifth chapter presents some general issues of hardware RAIDs, and then goes into detail of five specific products. The sixth chapter is not about RAID at all: it gives an overview of the Linux filesystems. The last chapter is a mix containing managing RAIDs, configuring hard disks, performance, and booting. The book is rounded off by literature abd internet references. The book uses kernel 2.4.

Comment

By now we know that Linux is important. Linux software RAID comes for free and is fairly good. Therefore the book is justified. The book gives a good introduction explaining the RAID levels. The discussion about ATA versus SCSI is good. The comparison is an important complementary topic. The comparison between software and hardware implementations of RAID is good, too. The author expresses his opinion. I like my author to have an opinion. Vadala argues the case of software RAID in Linux. The material about filesystem discussion is okay, but not necessary here. As others have also noted, some topics must come earlier and clearer. For example a discussion of boot loaders. The material about fault detection and correction could be improved. On the whole, the book could be more problem-oriented.

Who should read it?

To set up a RAID, there's not much secret and the book will give you some added detail, but no big surprises. If you are a home user you probably don't need this book, although you might be curious. If you are a system admin, the book is useful as it resumes the tools necessary to create and manage RAIDs by hand and contains much information in gathered, well-presented form. Most of the information is available on the net.

4 people found this helpful

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Hironobu SUZUKI

RAIDのことが一通り書いてくれているのがありがたい

Reviewed in Japan on July 11, 2005

Verified Purchase

この本の序説でも述べているのだが、Linuxは趣味や開発者のためだけではなく、企業の基幹システムや科学・医療研究システム、あるいは国際宇宙ステーションにまで利用されている。システムの信頼性は言うまでもなく重要である。物理的な稼動部を持つハードディスクはコンピュータシステム障害の主原因の１つであり、またハード的なクラッシュはデータを遺失してしまうという非常にクリティカルな問題を引き起こす。ソフトウェアRAIDの効用の説明は割愛するが、LinuxのソフトウェアRAIDを使おうとするとある問題にぶつかる。それはRAIDに関するドキュメントである。たしかに、ウェブ上では断片的な情報が大量に入手できるが、それでは全体を見通せない。この本は約２００ページながらも、必要な内容が一通り書いていてくれる。もちろんハードウェアRAIDのデバイスドライバの情報にも言及していてくれる。一々あちこちのウェブサイトの情報をかき集めて頭の中で再構成する（しかも書かれた時期が違うので微妙に違ったりする）よりはるかに便利だ。Linuxサーバ管理者は一冊手元に持っておくと非常に役に立つだろう。

4 people found this helpful

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