ZFS: i/o error all block copies unavailable

[Ruslan Yakovlev]

I think it is not bootcode problem. I not modify my bootcode when power 
halted. It is some problems in ZFS.
When I probe import ZFS pool (in 9.0-BETA1) it wrote that pool is busy. 
Only zpool import -f work.
After that I change mountpoint, list my files, replace mountpoint to / 
and reboot. Now on boot it wrote many errors (many strings "ZFS: i/o 
error..") and wrote file names.
First it /boot/kernel/kernel
when  I probe list files from bootcode, I can see only / and /boot, on 
/boot/kernel it wrote "ZFS: i/o error.."
But now copy of /boot/kernel work fine from flash
I do
# copy -r /boot /boot.new
# move /boot /boot.broken
# move /boot.new /boot
Now kernel boot, but stopped when probe mount ZFS storage as root. If I 
select boot string from menu and do #load /boot/kernel/zfs.ko it wrote 
"ZFS: i/o error.."
pmbr and gptzfsboot from 9.0-BETA1 don't change anything. Problem staying.
And I can't boot from kernel.old (it wrote "ZFS: i/o error.." too)

I think if I copy all my files to other storage and rebuild ZFS pool, 
problem leave, but now I don't have any other storage for all my data.

On 14.08.2011 14:10, rubyneko neko wrote:
> I have some problem too.
> Currently I'm working from kernel.old.
>
> gpart bootcode -p /boot/gptzfsboot -i 1 ad4
> for my not work.
>
> any idea?
>
> On Sun, 2011-08-14 at 13:16 +0300, Ruslan Yakovlev wrote:
> > Hi all
> > After power down on FreeBSD 8.2-STABLE #6 (now updated to #7, but
> > problem standing) I can't boot from ZFS v28.
> > gptzfsboot wrote
> >    boot: ZFS: i/o error all block copies unavailable
> > instead
> >    boot: qroot:/boot/kernel/kernel
> > I download FreeBSD 9.0-BETA1 image and boot from it. I can mount my ZFS
> > storage. I copy /boot from ZFS storage to flash and now kernel booted
> > from flash fine, after that ZFS storage mounted as / and all work. 
> zpool
> > scrub don't detect any problems. zpool status wrote "No known data 
> errors".
> > But it too slowly and I want normally boot from ZFS storage without
> > loading kernel from flash. How can I fix "ZFS: i/o error all block
> > copies unavailable" ?
> >
> > Now I have
> > FreeBSD QUAZIS.SNNLAN.local 8.2-STABLE FreeBSD 8.2-STABLE #7: Fri 
> Aug 12
> > 23:27:33 EEST 2011 
> root at QUAZIS.SNNLAN.local:/usr/obj/usr/src/sys/main8 i386
> >
> > => 34 976770988 ad4 GPT (465G)
> >
> > 34 256 1 freebsd-boot (128k)
> >
> > 290 16777216 2 freebsd-swap (8.0G)
> >
> > 16777506 959993516 3 freebsd-zfs (457G)
> >
> >
> >
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