zfs and vfs.zfs.prefetch_disable="1"
Ivan Voras
ivoras at freebsd.org
Mon Apr 28 09:12:00 UTC 2008
2008/4/28 Jeremy Chadwick <koitsu at freebsd.org>:
> On Sun, Apr 27, 2008 at 04:26:54PM +0900, Randy Bush wrote:
> > i have in my incantations for zfs on i386 to stick the following in
> > /boot/loader.conf.local
> >
> > vm.kmem_size=600M
> > vm.kmem_size_max=600M
> > zfs_load=YES
> > vfs.zfs.prefetch_disable=1
> >
> > but i have no idea where that last one crept in. any clues?
>
> It probably came from the old version of the "ZFS Tuning Guide" section
> of the ZFS on FreeBSD Wiki. It was removed on August 30th 2007 by Ivan
> Voras.
>
> http://wiki.freebsd.org/ZFSTuningGuide?action=diff&rev2=12&rev1=11
> http://wiki.freebsd.org/ZFSTuningGuide?action=recall&rev=12
> http://wiki.freebsd.org/ZFSTuningGuide?action=recall&rev=11
>
> I've CC'd him here.
The change you reference is apparently about zil_disable, which wasn't
removed, just moved. But the prefetch_disable setting was added and
removed a couple of times to the page, the latest being that it was
added since Pawel uses it in his post.
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