freebsd stable - Jul 2015 - 10.2-Beta i386..what's wrong..?

On Thu, Jul 23, 2015 at 08:42:44PM -0400, Brandon Allbery
wrote:
> On Thu, Jul 23, 2015 at 8:40 PM, Mark Linimon <linimon at
lonesome.com> wrote:
> 
> > zfs is a resource hog.  i386 is not able to handle the demand as well
> > as amd64.
> >
> 
> Even amd64 is no guarantee. I installed one of the Illumos spinoffs on a
> 2GB amd64 netbook (they mostly force zfs). I think it lasted 2 days before
> the kernel panics started.
> 
Even on amd64, you need to tune the system with less than 4GB RAM.

Glen

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On Fri, Jul 24, 2015 at 12:43:43AM +0000, Glen Barber
wrote:
> Even on amd64, you need to tune the system with less than 4GB RAM.
The only correct answer to "how much RAM do you need to run ZFS" is
"always more" AFAICT.

mcl

On Thu, Jul 23, 2015 at 8:43 PM, Glen Barber <gjb at freebsd.org> wrote:
> > Even amd64 is no guarantee. I installed one of the Illumos spinoffs on
a
> > 2GB amd64 netbook (they mostly force zfs). I think it lasted 2 days
> before
> > the kernel panics started.
> >
>
> Even on amd64, you need to tune the system with less than 4GB RAM.

I knew it wasn't going to fly, in fact I looked for ways to get the
installer to do ufs instead because I couldn't imagine zfs being able to
work in 2GB. Somehow I don't think old netbooks are in Illumos's plans.
:)

-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at
sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net

Glen Barber wrote:
> On Thu, Jul 23, 2015 at 08:42:44PM -0400, Brandon Allbery wrote:
> > On Thu, Jul 23, 2015 at 8:40 PM, Mark Linimon <linimon at
lonesome.com> wrote:
> > 
> > > zfs is a resource hog.  i386 is not able to handle the demand as
well
> > > as amd64.
> > >
> > 
> > Even amd64 is no guarantee. I installed one of the Illumos spinoffs on
a
> > 2GB amd64 netbook (they mostly force zfs). I think it lasted 2 days
before
> > the kernel panics started.
> > 
> 
> Even on amd64, you need to tune the system with less than 4GB RAM.
> 
> Glen
> 
..interrestingly people here seem to focus my problem to ZFS.. but my
problem was to build an raid over 4 disks on my old i386 machine and that
failed with 2 different approaches.

I'm accepting that ZFS is a too big thing for the i386 architecture
and I possibly should leave it alone on that machine.

But my 2nd try with gvinum failed also ...why?

In the meantime I've set up the first two disks to a geom_mirror and
installed 2x swap and a 66G ufs on the mirror, successfully installed
10.2-Beta, pulled the sources with svn and rebuild the entire world and a
kernel yesterday. That worked flawlessly.
So the hardware is out of the question here.

It seems that geom_vinum is broken and it is broken on 9.3 10.1 and
10.2-Beta. There isn't an other possibility anymore.
Can someone please confirm this with a similar machine?


Proably I could atach an IDE disk and move the new build system to it
to give ZFS a 2nd try on the 4 SCSI Disks to prove if something changed n
the meantime or if a kernel with KSTACK_PAGES=4 would fix the ZFS problem.

I had running gvinum and gmirror on that machine in the past up to
8.4-stable. It seems that we've lost this possibility now..

Regards,

Holm
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