Re: Used Dev Size is wrong

[Bart Kus <me@bartk.us>]

Michał Przyłuski wrote:
> Hello,
>
> 2009/10/25 Bart Kus <me@bartk.us>:
>   
>> # mdadm --detail /dev/md4
>> /dev/md4:
>>       Version : 1.02
>>  Creation Time : Sun Aug 10 23:41:49 2008
>>    Raid Level : raid6
>>    Array Size : 15628094464 (14904.11 GiB 16003.17 GB)
>>  Used Dev Size : 3907023616 (3726.03 GiB 4000.79 GB)
>> ...
>> # mdadm --examine /dev/sdc1
>> /dev/sdc1:
>> ...
>> Avail Dev Size : 3907023730 (1863.01 GiB 2000.40 GB)
>>    Array Size : 31256188928 (14904.11 GiB 16003.17 GB)
>>  Used Dev Size : 3907023616 (1863.01 GiB 2000.40 GB)
>>     
>
> Mostly likely cause is mdadm bug. Please let us know what's mdadm
> version, but I'd suggest getting the newest one, and just seeing if
> the output is correct. If I recall correctly, it's a bug related to a
> sector<->bytes change in output generating code. Not dangerous. It was
> brought to list's attention a while ago, I suppose it might've been in
> 2.6.7? From what I have installed here right now .4 and .9 are okay,
> and .7 is just wrong.
>
> And, as an aside comment, I think that some values of --detail,
> --examine and cat /proc/mdstat are not always what you'd expect during
> ongoing reshape. So if anything else is inconsistent right now, you
> might want to wait.
>
> Cheers,
> Mike
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>   
Excellent!  I'm running mdadm 2.6.8.  I compiled 2.6.9 in /tmp/ and when 
using that binary, it does show the correct size.  When Gentoo decides 
to upgrade, this little problem should fix itself.

Thanks!

--Bart

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