unable to boot a healthy zfs pool: all block copies unavailable

[Andriy Gapon]

On 05/11/2015 21:29, Eugene M. Zheganin wrote:
> Hi.
> 
> Today one of my zfs pool disks dies, I was unable to change it on the
> fly (video board was blocking it) so I powered off, changed disk (not in
> root pool) and all of a sudden I realized that i cannot boot:
> 
> ZFS: i/o error - all block copies unavailable
> ZFS: can't read MOS of pool zroot
> gptzfsboot: failed to mount default pool zroot
> 
> It was first reboot since October, 16th, when I installed recent -STABLE
> and upgraded zpool. I was pretty confident that I've installed loaders,
> but I tried to reinstall them - no luck. Then I built today's STABLE and
> installed loaders from it - same issue. I've even tried to install less
> recent loaders from a server nearby - same issue.
> 
> Two years ago I have encountered similar (if not identical) issue:
> https://lists.freebsd.org/pipermail/freebsd-stable/2013-December/076317.html
> The main difference was it was i386. Now I have an amd64 machine. I even
> updated it's BIOS, and I still cannot boot. Zpool is fine: I'm writing
> this message from this exact machine, however, I had to boot it from
> today -STABLE from an USB stick.
> 
> I've read about the zfsboottest utility and tried it on my unbootable
> pool - after the bried info about it (traated as healthy) it said "OK".
> I guess no errors were encountered.
> 
> So... what can I do to restore the ability to boot from my root pool ?

It could be that your BIOS is not able to read past 1TB (512 * INT_MAX). That
seems to be a rather common problem for consumer motherboards.
Here is an example of how it looked for me:
https://people.freebsd.org/~avg/IMAG1099.jpg
Fortunately, it wasn't a root pool that got the error.

> P.S. Some info about the pool below. let me know if it's not enough -
> I'll post more.
> 
> [root at bsdrookie:/]# zpool list
> NAME     SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
> zroot   1,79T   690G  1,12T         -    14%    37%  1.00x  ONLINE  -
> 
> [root at bsdrookie:/]# zfs list
> NAME                        USED  AVAIL  REFER  MOUNTPOINT
> zroot                       704G  1,05T  2,07G  legacy
> zroot/crypted               516G  1,06T   502G  -
> zroot/jails                2,16G  1,05T  2,03G  /usr/local/public/jails
> zroot/tmp                   223M  1,05T   223M  /tmp
> zroot/usr                   182G  1,05T  17,0G  /usr
> zroot/usr/home              145G  1,05T   145G  /usr/home
> zroot/usr/ports            17,0G  1,05T  2,79G  /usr/ports
> zroot/usr/ports/distfiles  14,3G  1,05T  14,3G  /usr/ports/distfiles
> zroot/usr/ports/packages    384K  1,05T   384K  /usr/ports/packages
> zroot/usr/public           2,11G  1,05T  2,11G  /usr/local/public
> zroot/usr/src              1,56G  1,05T  1,56G  /usr/src
> zroot/var                  1,19G  1,05T  83,7M  /var
> zroot/var/crash             992M  1,05T   992M  /var/crash
> zroot/var/db                113M  1,05T  39,7M  /var/db
> zroot/var/db/pkg           73,1M  1,05T  73,1M  /var/db/pkg
> zroot/var/empty             144K  1,05T   144K  /var/empty
> zroot/var/log              2,53M  1,05T  2,53M  /var/log
> zroot/var/mail              272K  1,05T   272K  /var/mail
> zroot/var/run               520K  1,05T   520K  /var/run
> zroot/var/tmp              22,7M  1,05T  22,7M  /var/tmp
> 
> 
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-- 
Andriy Gapon