add vs. re-add

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Hi all,

maybe this was already explained, but I could not
find something specific.

Given a parity array (RAID-456) with bitmap, when
add HDD accidentally disconnects, it can be re-added.
That is, only the bitmapped changes are synchronized.
Now, sometimes this is not possible, that is the
disk *must* be added, with full synchronization.

Questions:
1) What's the criteria used by "mdadm" to decide if
an HDD can be re-added or it must be added?
2) Knowing that the HDD can be re-added, can be this
forced? (I did *not* try --force).

Thanks,

bye,

-- 

piergiorgio
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