make kernel ignore broken SATA disk

[Stefan Bethke]

> 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.

# zpool status
  pool: data
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
	still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
	the pool may no longer be accessible by software that does not support
	the features. See zpool-features(7) for details.
  scan: resilvered 176K in 0 days 00:01:28 with 0 errors on Sun May 26 21:24:54 2019
config:

	NAME              STATE     READ WRITE CKSUM
	data              ONLINE       0     0     0
	  mirror-0        ONLINE       0     0     0
	    gpt/ls0data   ONLINE       0     0     0
	    gpt/ls1data   ONLINE       0     0     0
	logs
	  gpt/data0log    ONLINE       0     0     0
	cache
	  gpt/data0cache  ONLINE       0     0     0

errors: No known data errors

  pool: ls-host
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
	still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
	the pool may no longer be accessible by software that does not support
	the features. See zpool-features(7) for details.
  scan: scrub repaired 0 in 0 days 00:06:33 with 0 errors on Sun Apr 12 11:46:25 2020
config:

	NAME              STATE     READ WRITE CKSUM
	ls-host           ONLINE       0     0     0
	  mirror-0        ONLINE       0     0     0
	    gpt/ls0host   ONLINE       0     0     0
	    gpt/ls1host   ONLINE       0     0     0
	logs
	  gpt/host0log    ONLINE       0     0     0
	cache
	  gpt/host0cache  ONLINE       0     0     0

errors: No known data errors


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

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