Re: Linear device of two arrays

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On Tue, Jul 18, 2017 at 10:58 AM, Veljko <veljko3@xxxxxxxxx> wrote:
> On 07/17/2017 12:16 PM, Veljko wrote:
>>
>> On 07/15/2017 02:12 AM, NeilBrown wrote:
>>
>>> So command should be
>>>
>>>>>   dd if=/dev/md2 of=SOMEWHERE/SAFE bs=1M skip=5626590
>>>
>>>
>>> and expect it to create a 3M file.
>>>
>>> Use this 'skip' number of the 'seek' number later.
>>>
>>> NeilBrown
>>
>>
>> Thanks, Neil, now it makes more sense.
>>
>> I tried to create new linear device, but mdadm is complaining about
>> data-offset:
>>
>> # mdadm -C /dev/md4 -l linear -n 2 --rounding=1M -e 1.0 --data-offset=0
>> /dev/md2 /dev/md3
>>  mdadm: invalid data-offset: 0
>>
>> I'm using Debian 8.8 if it makes any difference.
>>
>> # mdadm -V
>>  mdadm - v3.3.2 - 21st August 2014
>>
>> What could be the problem?
>
>
> I noticed that md2 and md3 use 1.2 metadata. Can that be the issue? Trying
> to create 1.0 metadata for md4?

Any advice on this?
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