From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Landman <joe.landman@gmail.com>
Subject: Re: 20 drive raid-10, CentOS5.5, after reboot assemble fails - all
 drives "non-fresh"
Date: Mon, 08 Aug 2011 00:40:43 -0400
Message-ID: <4E3F68CB.4060005@gmail.com>
References: <4E3F4BD0.5060807@aeoncomputing.com> <20110808125608.7ceeaa02@notabene.brown> <4E3F66F2.3030300@aeoncomputing.com>
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To: Jeff Johnson <jeff.johnson@aeoncomputing.com>
Cc: linux-raid@vger.kernel.org
List-Id: linux-raid.ids

On 08/08/2011 12:32 AM, Jeff Johnson wrote:

> It is good I can start the raid manually but it isn't supposed to work
> like that. Any idea why assembling from a config file would fail? Here
> is the latest version of the config file line (made with mdadm --examine
> --scan):

Jeff,

   You might need to update the raid superblocks during the manual assemble.

   mdadm --assemble --update=summaries /dev/md3 /dev/sd[c-v]1

   Also, you can simplify the below a bit to the following:

>
> ARRAY /dev/md3 level=raid10 num-devices=20 metadata=0.90 spares=4
> UUID=e17a29e8:ec6bce5c:f13d343c:cfba4dc4

ARRAY /dev/md3 UUID=e17a29e8:ec6bce5c:f13d343c:cfba4dc4

>
> --Jeff
>
> On Sun, Aug 7, 2011 at 7:56 PM, NeilBrown<neilb@suse.de
> <mailto:neilb@suse.de>>wrote:
>
> On Sun, 07 Aug 2011 19:37:04 -0700 Jeff Johnson
> <jeff.johnson@aeoncomputing.com
> <mailto:jeff.johnson@aeoncomputing.com>> wrote:
>
>  > Greetings,
>  >
>  > I have a 20 drive raid-10 that has been running well for over one
> year.
>  > After the most recently system boot the raid will not assemble.
>  > /var/log/messages shows that all of the drives are "non-fresh".
>
> --snip--
>
> You really don't want that 'devices=" clause in there. Device names can
> change..
> --snip--
>
>  > Events : 90
>  > Events : 90
>  > Events : 92
>  > Events : 92
>  > Events : 92
>  > Events : 92
>
> So the spares are '92' and the others are '90'. That is weird...
>
> However you should be able to assemble the array by simply listing
> all the
> non-spare devices:
>
> mdadm -A /dev/md3 /dev/sd[c-v]1
>
> NeilBrown
>
>
> --
> ------------------------------
> Jeff Johnson
> Manager
> Aeon Computing
>
> jeff.johnson "at" aeoncomputing.com <mailto:jeff.johnson@aeoncomputing.com>
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