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Date:      Sun, 12 Apr 2020 10:53:24 -0600
From:      Ian Lepore <ian@freebsd.org>
To:        Stefan Bethke <stb@lassitu.de>, freebsd-stable <freebsd-stable@freebsd.org>
Subject:   Re: make kernel ignore broken SATA disk
Message-ID:  <36793c9efb905968508e94690b59d926f30af36b.camel@freebsd.org>
In-Reply-To: <A33629CA-63EC-45AA-AB06-09B003BBB0A6@lassitu.de>
References:  <A33629CA-63EC-45AA-AB06-09B003BBB0A6@lassitu.de>

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On Sun, 2020-04-12 at 16:37 +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.
> 
> 

The the loader prompt (or in loader.conf without 'set'):

set hint.ada.1.disabled=1 

-- Ian





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