ZFS i/o error in recent 12.0

[Andriy Gapon]

On 20/03/2018 09:09, Trond Endrestøl wrote:
> This step has been big no-no in the past. Never leave your 
> bootpool/rootpool in an exported state if you intend to boot from it. 
> For all I know, this advice might be superstition for the present 
> versions of FreeBSD.

Yes, it is.  That does not matter at all now.

> From what I can tell from the above, you never created a new 
> zpool.cache and copied it to its rightful place.

For the _rooot_ pool zpool.cache does not matter as well.
It matters only for auto-import of additional pools, if any.

-- 
Andriy Gapon