GPT boot with ZFS RAIDZ "ZFS: i/o error - all block copies unavailable"

[Robert Noland]

On Tue, 2009-11-17 at 22:43 +0100, Emil Smolenski wrote:
> On Mon, 16 Nov 2009 19:33:34 +0100, Emil Smolenski <ambsd at raisa.eu.org>  
> wrote:
> 
> >> Matt's patch only effects raidz volumes.
> >   Oh, I see. Maybe there is similar bug in ZFS on single disk volumes  
> > also?
> 
> >>>   (is this procedure of updating zfsboot correct?)
> >> This should be correct for updating the first stage bootstrap code.  The
> >> loader (boot/loader) is actually updated during installworld.
> >
> >   I'll try full build/installworld tomorrow.
> 
>   It, unfortunately, didn't solve this issue. Should I file a PR? I would  
> like to help in debugging it (however my skills in low-level C aren't  
> strong enough to do it on my own).

Ok, the first thing I would like to see is "zdb -uuu".  I don't see an
obvious issue with single disk reads.  My own setup uses 2 x 1TB
currently.  Failing to read the MOS is basically the first read attempt
from the pool, in fact it is the read that attempts to mount the pool.

robert.

-- 
Robert Noland <rnoland at FreeBSD.org>
FreeBSD