8.1 amd64 lockup (maybe zfs or disk related)

Jeremy Chadwick freebsd at jdc.parodius.com
Mon Feb 7 09:03:50 UTC 2011

On Mon, Feb 07, 2011 at 02:50:42AM -0500, Zaphod Beeblebrox wrote:
> On Sun, Feb 6, 2011 at 11:55 PM, Jeremy Chadwick
> <freebsd at jdc.parodius.com> wrote:
> > Given that you're running 8.1-RELEASE, what sort of ZFS tunings are you
> > using in /boot/loader.conf?  Tuning is required on this version
> I haven't seen any new tuning recommendations.  Has the tuning
> required on an 8G amd64 platform changed from 8.0 to 8.1?

They're discussed practically on a monthly basis on the mailing lists
(either freebsd-fs or freebsd-stable).  Keeping track of them is almost
impossible at this point, which is also probably why the Wiki is

See my other follow-up post to the OP regarding what most of the tunings
should be.  On an 8.0 system, there may be some tunings I listed off
that won't work (loader(8) will complain "no such tunable" and won't
boot).  I think the UMA tunable is one of those.

Please don't ask me "how was I supposed to know about any of this?" --
basically folks are ""expected"" to follow every single CVS or SVN
commit to the FreeBSD tag you track/use, and are expected to read the
diffs when there's a commit and "figure it out themselves".  The release
notes between 8.x and 8.x+1 don't disclose tunable changes either.  If
you don't like this model/approach, there are appropriate channels to
send your complaints through -- but I myself simply gave up.

| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.               PGP 4BD6C0CB |

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