RAID-5 degraded mode question

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All,
  I have question on degraded mode RAID-5 operation md driver. If I
understand reads from the degraded mode md would cause  parity
calculations or rebuild of  data happens for every request. 

 Also as soon as disk failed md drivers marks that drive as faulty and
continue operation in degraded mode right ? Is there a way to get out
the degraded mode without adding spare drive. Assuming we have 5 disk
system with one failed drive.

Thanks in advance,
Marri
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