Resync intermittently writes to spare drives, waking them up

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I have a RAID5 array with 4 active devices and two spares. The spares
are normally in sleep mode. I ran a resync with:

echo repair > /sys/devices/virtual/block/md0/md/sync_action

About 20 times (evenly spaced apart) during the resync, the spares
were written to, waking them up. Is that behavior desired? It seems to
me that it's a waste--I don't know why the resync would bother with
the spares.

--Rory
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