>From the man page:
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
overridden with the --force option.
I admit that I don't understand this at all (spotted this bug while
looking for something else), but thought it might be helpful.
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mdadm uses one more spare that specified while creating a RAID5 array
https://bugs.launchpad.net/bugs/491377
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