On Monday January 2, djani22@xxxxxxxxxxxxx wrote:
>
> 5. The question
>
> Why shows sdh2 as spare?
> The MD array size is correct.
> And i really can see, the all drive is reading, and sdh2 is *ONLY* writing.
>
man mdadm
Towards the end of the CREATE MODE section:
When creating a RAID5 array, mdadm will automatically create a degraded
array with an extra spare drive. This is because building the spare
into a degraded array is in general faster than resyncing the parity on
a non-degraded, but not clean, array. This feature can be over-ridden
with the --force option.
I hope this clarifies the situation.
NeilBrown
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