Date: Wed, 13 Apr 2016 18:46:09 -0500 From: Brandon J. Wandersee <brandon.wandersee@gmail.com> To: Luciano Mannucci <luciano@vespaperitivo.it> Cc: freebsd-questions@freebsd.org Subject: Re: ZFS with errors Message-ID: <86h9f5ax8e.fsf@WorkBox.Home> In-Reply-To: <3qlQxr34YhzRRqQ@baobab.bilink.it> References: <3qlNxw33PhzRRqR@baobab.bilink.it> <alpine.BSF.2.20.1604131538480.14591@mail.fig.ol.no> <alpine.BSF.2.20.1604131548030.14591@mail.fig.ol.no> <3qlQxr34YhzRRqQ@baobab.bilink.it>
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Luciano Mannucci writes: > On Wed, 13 Apr 2016 15:56:20 +0200 (CEST) > Trond Endrestøl <Trond.Endrestol@fagskolen.gjovik.no> wrote: > >> There's no redundancy in this pool, making it hard for ZFS to >> automatically repair your files. >> >> Maybe you should destroy your pool and recreate it using a mirrored >> configuration. Maybe, mirror disks 1 & 2, and disks 3 & 4, e.g. > They are of different sizes. I don't know if I can add redundancy > without loosing the bits that exeed the smallest one... > I'm a zfs newbie, just experimenting by now... :) Experimenting is good, but you've sort of dived head-first into the bad practices deep end. A striped ZFS pool consisting of four disks of different sizes is probably *less* reliable (and possibly less performant) than a a single disk formatted with a traditional filesystem. Your data has no redundancy, the pool will only perform as well as the slowest of the four disks, and a problem with any one disk will affect all data. Even a one-disk ZFS stripe with the "copies" property raised is probably better than a large, multi-disk stripe. You can read the original "ZFS Best Practices" guide for some more info.[1] Some of it is either slightly out-of-date, or applies only to Solaris, but most of it is still relevant to FreeBSD today. If you're willing to spend a little money, "FreeBSD Mastery: ZFS" by Michael W. Lucas is pretty good.[2] [1]: http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide [2]: https://www.tiltedwindmillpress.com/?product=fmzfs -- :: Brandon J. Wandersee :: brandon.wandersee@gmail.com :: -------------------------------------------------- :: 'The best design is as little design as possible.' :: --- Dieter Rams ----------------------------------
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