[PC-BSD Testing] Panic from ZFS

Arthur a-koziol at neiu.edu
Fri Oct 24 05:09:01 PDT 2008


At 02:49 AM 10/24/2008, you wrote:
>On Fri, Oct 24, 2008 at 7:30 AM, Edward O'Callaghan
><victoredwardocallaghan at gmail.com> wrote:
> > Hi,
> >
> > You can get version 6 of zfs to panic in FreeBSD by doing the following;
> > * Have 512 or less MB of RAM
> > * Fill most of your zpool up then run a zpool scrub on the pool..
> >
> > This is a out-of-memory kernel panic that particularly affects i386.
> >
> > My suggested work around is to put the following into loader.conf
> > vfs.zfs.zil_disable=1
> > vfs.zfs.prefetch_disable=1
> >
> > N.B. Disabling ZIL can have serious consequences depending on 
> your workload.
> > FreeBSD 8 upgrades ZFS to version 11. However I am not sure how this
> > affects things as this only happens on FreeBSD and not Solaris.
> >
> > Kris, As I said before. I highly recommend you disable ZFS support on
> > 32bit systems with less then 1gb of ram else people _could_ lose data
> > ?
>
>I've always believed that there is a HEADS UP somewhere that said
>something about dedicating at least 1GB for ZFS on FreeBSD.

Yes, I remember this as well.

Arthur 



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