make kernel ignore broken SATA disk

[Chris]

On Sun, 12 Apr 2020 16:37:06 +0200 Stefan Bethke stb at lassitu.de said

> I have a server I don't have physical access to right now, which has a broken
> SATA disk that produces mostly errors (but not entirely).
> 
> The disk has two partitions that are part of a zpool each. I can't bring the
> system up with this disk being online, because ZFS is trying its darndest to
> use it.
> 
> I already renamed the GPT partitions in the hope that ZFS would not find them
> anymore, but it does.
> 
> I can't gpart destroy -f ada1 because "device busy".
FTR it's gpart destroy -F (note the case difference) :-)

> 
> Is there a way, ideally in the loader, to tell the kernel to ignore ada1
> and/or ahcich5? Or can I force ZFS some other way to ignore the disk? I do
> have a spare disk I can use to replace the failed one, but I can't get the
> machine into a state where I could even issue the zpool replace command.
> 
> 
> Stefan
> 
--Chris