From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: mdadm --fail requires writeable drive.
Date: Fri, 15 Nov 2013 15:46:27 +1100
Message-ID: <20131115154627.14364eb3@notabene.brown>
References: <52836DD1.8080605@mpstor.com>
	<20131114114449.27f3c746@notabene.brown>
	<5285094D.9070904@mpstor.com>
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To: Benjamin ESTRABAUD <be@mpstor.com>
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On Thu, 14 Nov 2013 17:33:01 +0000 Benjamin ESTRABAUD <be@mpstor.com> wrote:

> Hi Neil,
>=20
> This does work but I was looking for a way to explicitely set a=20
> particular device as Failed (I want to process devices one by one).
>=20
> But right now I was reading from the array to force it detecting the=20
> failure as opposed to using "detached" which orders of magnitude better.
>=20
> Thanks for the tip, I'll use that for now.

If you really want to just fail one of them you can used the "kernel name"
like "sda1".
If you
   ls -d /sys/block/mdXX/md/dev-*

you will see the devices that are though to be part of the array.  The part
of the name after "dev-" is the "kernel name".
"mdadm /dev/mdXX --fail" will accept a "kernel name" and will mark just that
device as faulty.

NeilBrown


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