On Wed, 10 Mar 2010 08:43:43 +0100
Keld Simonsen [off-list ref] wrote:

Hi

I made a raid10,f2 arrray (actually 2 arrays) with only one
active disk, one missing. This was after 2 disks were found faulty,
and I then copied the data from my faulty raid to the new  raid, and
installed my other new 2 TB disk. I added the new disk with
     mdadm /dev/md9 --add /dev/sdg1
and it was then listed as a spare. I wanted to activate it, and thought
that --add ing it would automatically start resyncing, but no...
I then tried to force resyncing by 
     mdadm -A /dev/md9 --update resync
but it did not work either. Now I am lost. How do I activate the spare?

kernel 2.6.12 mdadm v1.12.0

Wow, that's OLD!..
Maybe try a newer kernel, it has probably been fixed.

Yes, --adding the device could cause it to store recovery.  I do recall there
have been a few different situations that caused that not to work, but I
don't recall the details.

If you have a service contract, complain to your vendor.  If not, upgraded to 
something a bit less than 5 years old ;-)

sorry I cannot be more helpful.

NeilBrown

best regards
keld
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