Re: recovering a mirrored arry.

["Kristleifur Daðason" <kristleifur@gmail.com>]

On Fri, Feb 5, 2010 at 6:50 PM, Keld Simonsen <keld@keldix.com> wrote:
> On Fri, Feb 05, 2010 at 04:25:02PM +0000, Kristleifur Daðason wrote:
>> On Fri, Feb 5, 2010 at 1:19 AM, Keld Simonsen <keld@keldix.com> wrote:
>> > On Wed, Feb 03, 2010 at 03:57:58AM +0100, Keld Simonsen wrote:
>> > Hi
>> >
>> >
>> > can anybody help me with this? I am stuck with recovering my system here.
>> > is it a sensible thing ro do?
>> >
>> > best regards
>> > keld
>> >
>> >> Hi
>> >>
>> >> I got 2 arrays in error of the raid10 type.
>> >>
>> >> I think this is because my motherboard died, and then the fs were
>> >> corrupted.
>> >>
>> >> My thoughts were that actually one of the copies could be correct.
>> >> So I would like to try out the consistency of each part of the raid10
>> >> (it is 2-partition arrays), and then if I find one that is consistent, then
>> >> resync the faulty one with the good one.
>> >>
>> >> How do I do this?
>> >>
>> >> it seems that I cannot just assemble an array with a missing part.
>> >> If I assemble the full array, is there then a risk of the bad one
>> >> corrupting the good one? And can I declare one of the disks faulty
>> >> then test the other one, then declare nbr 2 disk for faulty and
>> >> declare the first one as good?
>> >>
>> >> I dont see anything on the wiki on this.
>> >>
>> >> best regards
>> >> keld
>> > --
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>> >
>>
>>
>> I wish I could help more, but check out this from the mdadm man page:
>>
>>        To create a "degraded" array in which some devices are missing,
>> simply give
>>        the word "missing" in place of a device name.  This  will
>> cause  mdadm  to
>>        leave  the  corresponding  slot  in  the array empty.  For a
>> RAID4 or RAID5
>>        array at most one slot can be "missing"; for a  RAID6  array
>> at  most  two
>>        slots.   For a RAID1 array, only one real device needs to be
>> given.  All of
>>        the others can be "missing".
>
> I tried missing, but mdadm said that it could not find missing as a device,
> for assemble mode.
>
> best regards
> keld
>

Hmmm ... I guess your version of mdadm may be too old. Which version
do you have?
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