make kernel ignore broken SATA disk

[Stefan Bethke]

Am 12.04.2020 um 19:03 schrieb Slawa Olhovchenkov <slw at zxy.spb.ru>:
> 
> On Sun, Apr 12, 2020 at 06:38:10PM +0200, Stefan Bethke wrote:
> 
>> 
>> 
>>> Am 12.04.2020 um 18:31 schrieb Slawa Olhovchenkov <slw at zxy.spb.ru>:
>>> 
>>> On Sun, Apr 12, 2020 at 06:24:09PM +0200, Stefan Bethke wrote:
>>> 
>>>> Am 12.04.2020 um 17:43 schrieb Slawa Olhovchenkov <slw at zxy.spb.ru>:
>>>>> 
>>>>> On Sun, Apr 12, 2020 at 04:37:06PM +0200, Stefan Bethke wrote:
>>>>> 
>>>>>> 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".
>>>>>> 
>>>>>> 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.
>>>>> 
>>>>> `zpool offline pool device` if you have enoght redundancy?
>>>> 
>>>> I do, but the command doesn't return. Instead, I'm getting loads of sata error message.
>>> 
>>> What you zpool configuration?
>> 
>> This is from the working system. The identifiers are slightly different, but the structure is identical.
> 
> what about `zpool detach <pool> <device>` ?

Now I can't boot into single user mode anymore, ZFS just waits forever, and the kernel is printing an endless chain of SATA error messages.

I really need a way to remove the broken disk before ZFS tries to access it, or a way to stop ZFS from try to access the disk.


Stefan

--
Stefan Bethke <stb at lassitu.de>   Fon +49 151 14070811

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