Re: raid5 - adding journal to an existing device?

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> On Mar 2, 2017, at 10:39 AM, Shaohua Li <shli@xxxxxxxxxx> wrote:
> 
> On Sat, Feb 25, 2017 at 11:12:21PM +0900, Tomasz Chmielewski wrote:
>> mdadm manual specifies the following for create, build and grow modes:
>> 
>>       --write-journal
>>              Specify journal device for the RAID-4/5/6 array.
>> 
>> However:
>> 
>> # mdadm --grow /dev/md2 --write-journal /dev/sdc1
>> mdadm: :option --write-journal not valid in grow mode
>> 
>> 
>> Is it not yet supported, will never be supported, or am I simply trying to
>> use it in a  wrong way?
>> 
>> 
>> 
>> Tried the following versions:
>> 
>> # ./mdadm -V
>> mdadm - v3.4-115-ge22fe3a - 29th November 2016
>> 
>> # mdadm -V
>> mdadm - v3.4 - 28th January 2016
> 
> Cc: Song and Jes.
> 
> I think we support hotadd journal. Will let Song clarify.
> 
> Thanks,
> Shaohua

We have support for hotadd journal to an array with broken/missing journal. 
We haven't implement hotted journal to arrays with no journal ever. We do plan
to add the feature. 

Thanks,
Song--
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