Date: Mon, 17 Sep 2012 14:25:09 +0300 From: Volodymyr Kostyrko <c.kworr@gmail.com> To: freebsd-questions@freebsd.org, jamie@kode5.net Subject: Re: Questions about ZFS Tuning Message-ID: <50570895.4030709@gmail.com> In-Reply-To: <20120917103632.GA25763@kontrol.kode5.net> References: <20120917103632.GA25763@kontrol.kode5.net>
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17.09.2012 13:36, Jamie Paul Griffin wrote: > When I installed FreeBSD on my Lenovo Think Center Desktop I created a full ZFS Root file system using Matthew Seaman's excellent article: > > http://www.infracaninophile.co.uk/articles/install-on-zfs/ > > My system now is: /home/jamie $ uname -a > FreeBSD kontrol.kode5.net 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #4 r240560: Sun Sep 16 18:40:56 BST 2012 root@kontrol.kode5.net:/usr/src/sys/amd64/compile/KONTROL amd64 > > I've been wondering about ZFS tuning and have read some articles, including the FreeBSD handbook and wiki articles and also some posts in the FreeBSD forum. > > The FreeBSD handbook [http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/filesystems-zfs.html], section 21.2.1.3 Loader Tunables > suggests adding tunables to /boot/loader.conf for ALL architectures - which I tested: Handbook is old and cripsy about that all thing yet provides a useful link to http://wiki.freebsd.org/ZFSTuningGuide - you don't need kmem_size/arc tuning on amd64 generally; - zfs.zfs.prefetch_disable=0 will cause system eat more RAM then without it; - there are a lot of tunables but you should learn what you are doing before setting anything, for example changing recordsize for already running MySQL database filesystem will do nothing at all. -- Sphinx of black quartz judge my vow.
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