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FreeBSD Mastery: ZFS (IT Mastery) (Volume 7), by Michael W. Lucas Allan Jude
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Review
"Once again a great FreeBSD book to read." - nixCraft
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Product details
Series: IT Mastery (Book 7)
Paperback: 234 pages
Publisher: Tilted Windmill Press (May 16, 2015)
Language: English
ISBN-10: 1642350001
ISBN-13: 978-1642350005
Product Dimensions:
6 x 0.5 x 9 inches
Shipping Weight: 12.6 ounces (View shipping rates and policies)
Average Customer Review:
4.9 out of 5 stars
21 customer reviews
Amazon Best Sellers Rank:
#262,279 in Books (See Top 100 in Books)
An excellent book. A must read for anyone starting out in ZFS. For the new people, however, do be aware that this book (as the title suggests) focuses on FreeBSD. There are differences in how things work at the nitty gritty level between FreeBSD, Linux, and MacOS. This is great if you're working with an appliance like FreeNAS, but if you're trying to roll your own Linux based NAS with ZFS backing the storage, understand that you may run into certain differences. Disk formatting, and encryption being two examples.Can you get this information from various posts around the Internet? Sure. You can also get a lot of misinformation around the Internet. For $10 or $25, why not get the information straight from the source?
This book has many useful, practical, and above all contemporary ZFS tactics and strategies in it. It is well organized, and is cogently written in a clear and conversational style. It shows the basics of applying ZFS on FreeBSD, but can also be used on systems like Solaris and OpenIndie. There is also an advanced book comming soon. I think they should have concentrated on a more tutorially-presented sequencing, and with more thoughtfully developed and interconnected examples. If the book is going to be a reference source for you, it's great. As a tutorial, it has some shortcomings, IMHO.Just as an aside at this point, you can use the man pages on zfs and zpool, and Google for more important and useful details, tutorials, and context about ZFS than this book provides. Then again, you have to wade through a lot of extraneous material when you do that!For instance, in Chapter 3 on zpools, they start off with using 6 hardware providers(vdevs) in a pool that they say are hard disks. The labeling of the disks as vdevs is not clear. How many people can use 6 separate hard drives on a prototype or test machine? So they develop several examples using those vdevs in multiple pools, yet they show how to destroy a pool only at the end of the chapter! To sequence all of their examples so that someone could do them in the order presented, the zpool destroy command should have been shown in the beginning of the chapter, right after the first zpool create. You cannot proceed from the zpool create on page 56 to the remaining pools in that chapter without destroying the pools as you go along. One GEOM provider per vdev, one zpool per vdev! The rule for me is one vdev mapped to one pool. When I do a basic Install of FreeBSD or PC-BSD on a whole disk, that disk as a storage provider cannot have another pool on it- the default pool tank is mapped to the whole root or system disk.So as recommended in this book, during my initial install of the system, I could partition the hard disk into a system partition with the OS and ZFS on it, and then add other zpools on other partitons of one hard disk. Smart idea from a couple of perspectives.Just as a footnote to this discussion, online Googled and other beginning zpool tutorial examples use files as vdevs, much more realistic for introductory work, although not recommended in practice. I have routinely used USB thumbdrives as vdevs, mirrored them and done many of the basic zfs and zpool tactics on the USB thumbdrives, on all three OS's I run.Also, on page 24 in the Virtual Devices chapter, they say to use partitions as a storage provider. That is an interesting and contermporary performance advantage in FreeBSD and PC-BSD (not so in Solaris and OpenIndiana). They even give you a heads up that deleting vdevs from a zpool, and shrinking zpools will be included in later releases of FreeBSD (and by extension PC-BSD), and probably in Solaris and OpenIndie too. Like I said, very contemporary.I use ZFS on both PC-BSD and Solaris, and have used it on OpenIndiana. It's pretty much the same on all three systems. My computer hardware is HP Microserver, Dell Poweredge server, and Dell Inspiron laptop. The laptop with only one hard drive in it can have zfs copies set to 2 so there is some redundancy on that single hard drive.In summary, there should be some linear consistency or sequential development of the examples in a chapter, starting at one place with one command, and step -by -step moving to a more complex state, through related commands working on the same vdevs, pools, or datasets as you started with. I found the examples are too fragmented (if that's a good word for it), perhaps good for reference but not for a tutorial presentation.
All of this information is readily available scattered across many different corners of the project pages, blogs, and man pages. This is a great first read if you are looking at getting into ZFS, however, if you're already an advanced user you may learn a few minor things or tricks that you missed along the way.If I hadn't been watching BSDNow (with Alan Jude) I'm sure I would have gotten more from this book as there is some bleed over.
There are man pages, and there is hard fought knowledge. This book is the latter. It is written for human beings, by human beings, based on real-life experience. Equally important is that these guys know how to teach, which, is a rare trait in tech. ZFS will change your life as a sysadmin.
Michael Lucas continues to impress with the technical quality and readability of his IT Mastery series. All manner of ZFS usage, configuration and maintenance is covered with just the right depth and concise to-the-point language. I will soon own all of Lucas' technical works. This is not an exhaustive architectural documentation, which it shouldn't be, but will have you on your way to correctly leveraging ZFS' amazing technology in short time.
Excellent book on ZFS. I've been using ZFS casually for a few years now, and there is a lot of material I didn't know in this book. It's also useful for other operating systems that include ZFS.The coverage of snapshots and enabling extra features is just the right length. It's informative and not boring.
Great book, interesting topic and easy to follow.
I believe this is a must read book for sysadmins, it also shows a little bit from the power of open source.Enjoy!
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