Date: Mon, 17 Sep 2012 18:33:53 +0100 From: Jamie Paul Griffin <jamie@kode5.net> To: freebsd-questions@freebsd.org Subject: Re: Questions about ZFS Tuning Message-ID: <20120917173353.GA1886@kontrol.kode5.net> In-Reply-To: <201209171819.18049.jmc-freebsd2@milibyte.co.uk> References: <20120917103632.GA25763@kontrol.kode5.net> <50570895.4030709@gmail.com> <20120917122014.GC25763@kontrol.kode5.net> <201209171819.18049.jmc-freebsd2@milibyte.co.uk>
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[ Mike Clarke wrote on Mon 17.Sep'12 at 18:19:18 +0100 ] > On Monday 17 September 2012 13:20:14 Jamie Paul Griffin wrote: > > > I set zfs.zfs.prefetch_disable=0 because some dmesg line suggested/implied > > it would benefit. I don't recall the exact output now. > > If you look in /var/run/dmesg.boot you should find the message saying "ZFS > NOTICE: Prefetch is disabled by default if less than 4GB of RAM is present; > to enable, add "vfs.zfs.prefetch_disable=0" to /boot/loader.conf." > > Since you have 2GB RAM then it's best to leave things as they are with > prefetch disabled. Hi Mike, yes that was the notice I saw which made me add this setting. Thanks for the reminder and info. Best wishes, Jamie.
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