I am now able (thanks to Neil's suggestion) manually assemble the
/dev/md3 raid10 volume using:
mdadm -A /dev/md3 /dev/sd[cdefghijklmnopqrstuv]1
and then manually adding the spares back with: mdadm --add /dev/md3
/dev/sd[wxyz]1
The data is intact, phew! I am still unable to start the raid using a
config file. I gracefully stopped the raid using 'mdadm --stop /dev/md3'
and then tried 'mdadm -A /dev/md3 -c /etc/mdadm.conf.mdt' and it fails
to start.
I recreated the config file using 'mdadm --examine --scan >
/etc/mdadm.conf'. Then I stopped /dev/md3 and tried to assemble it again
using 'mdadm -A /dev/md3' and it fails to assemble and start.
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):
ARRAY /dev/md3 level=raid10 num-devices=20 metadata=0.90 spares=4
UUID=e17a29e8:ec6bce5c:f13d343c:cfba4dc4
--Jeff
On Sun, Aug 7, 2011 at 7:56 PM, NeilBrown<neilb@xxxxxxx
<mailto:neilb@xxxxxxx>>wrote:
On Sun, 07 Aug 2011 19:37:04 -0700 Jeff Johnson
<jeff.johnson@xxxxxxxxxxxxxxxxx
<mailto:jeff.johnson@xxxxxxxxxxxxxxxxx>> 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@xxxxxxxxxxxxxxxxx>
www.aeoncomputing.com <http://www.aeoncomputing.com/>
t:858-412-3810 x101 <tel:858-412-3810%20x101> f:858-412-3845
<tel:858-412-3845>
4905 Morena Boulevard, Suite 1313 - San Diego, CA 92117
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