Date: Mon, 17 Sep 2012 13:20:14 +0100 From: Jamie Paul Griffin <jamie@kode5.net> To: freebsd-questions@freebsd.org Subject: Re: Questions about ZFS Tuning Message-ID: <20120917122014.GC25763@kontrol.kode5.net> In-Reply-To: <50570895.4030709@gmail.com> References: <20120917103632.GA25763@kontrol.kode5.net> <50570895.4030709@gmail.com>
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[ Volodymyr Kostyrko wrote on Mon 17.Sep'12 at 14:25:09 +0300 ] > 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. Yes, I've seen lot's of information about ZFS tunables on FreeBSD which will give me plenty of reading. I set zfs.zfs.prefetch_disable=0 because some dmesg line suggested/implied it would benefit. I don't recall the exact output now. So, I think it's probably best I just leave things as they are as my system is functioning well enough, as far as I can tell anyway. This is the first time I've used ZFS on FreeBSD so I am still very much in the 'learning process' where that is concerned. Thanks for your response Volodymyr. Very much appreciated. Best wishes, Jamie.
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