While replacing a failed disk in software RAID, why does it get added as a spare instead of active one?

Solution Unverified - Updated -

Issue

  • While adding a disk to a raid device it gets added as a spare instead of adding as an active one.
  • mdadm does not resync the data to a new disk added to the raid device.

Environment

  • Red Hat Enterprise Linux (RHEL) 6

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