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

Thanks for your response, that's a good idea. The HDDs are connected to 
a Supermicro AOC-S3008L-L8e, which has a Broadcom 3008 SAS controller 
supported by mpt(4). I have to take a break now but will try getting 
into the BIOS next.

On Fri 2023-01-06 12:13 PM MST -0700, <mike@sentex.net> wrote:

> 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