Re: ZFS: i/o error - all block copies unavailable

On 1/6/2023 2:08 PM, John Doherty wrote:
> Posting this to freebsd-fs because the problem appears to be related 
> to ZFS.
>
> I have a system running FreeBSD 12.3-RELEASE to which I have only 
> remote access (about 3,300 miles from where I am).
>
> This morning I ran "freebsd-update fetch" and "freebsd-update install" 
> on it. This was to get it up to date with 12.3 in preparation for a 
> further update to 13.1-RELEASE.
>
> I rebooted the machine after "freebsd-update install" and it doesn't 
> boot all the way. I connected to its IPMI and by recording the screen 
> while trying to boot it, I was able to capture error messages that 
> went by too fast to read otherwise:
>
> ZFS: i/o error - all block copies unavailable
> ZFS: can't read MOS of pool zp0
>
Is the disk controller's driver being loaded by the kernel ? What is the 
driver ?  Is it possible that the disk order has been messed up and its 
trying to boot not from the boot pool, but from disks in zp0 and not 
trying zroot ? If you have ipmi, try and go into the BIOS and make sure 
the disk its trying to boot from first is indeed part of zroot

     ---Mike