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Date: Mon, 10 Dec 2007 09:06:50 -0800
From: "Michael Haro" <mharo@freebsd.org>
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To: "Alexandre Biancalana" <biancalana@gmail.com>
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Cc: freebsd-current@freebsd.org, Benjamin Close <Benjamin.Close@clearchain.com>
Subject: Re: 7-BETA3 everyday reboot
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On 12/10/07, Alexandre Biancalana <biancalana@gmail.com> wrote:
>
> On 12/7/07, Michael Haro <mharo@freebsd.org> wrote:
> >
> >
> > > > I have found that turning off zil and prefetch seem to keep things
> > > > happier on one of the heavily loaded servers that I look after.
> > > > It also appears to prevent a deadlock under very heavy load -
> something
> > > > I've not yet had time to debug.
> > > > Try adding:
> > > >
> > > > vfs.zfs.zil_disable=1
> > > > vfs.zfs.prefetch_disable="1"
> > > >
> > > > to /boot/loader.conf
> > > >
> > > > and let us know if it makes a difference.
> > >
> > > Added now only
> > >
> > > vfs.zfs.prefetch_disable="1"
> > >
> > >
> > > I let you know the result.
> >
> > Is the result promising?
> >
> >
> Yes ! The machine does not reboot anymore !


What combination of settings did you have to do to make it stable?  I tried
setting vfs.zfs.prefetch_disable="1' in loader.conf and my machine still
panics within 20 minutes during (I think) large file transfers.