One of my hard drives in a software RAID array with redundancy failed. What can I do?

Solution Verified - Updated -

Issue

  • My server has a RAID 1/4/5/6/10 array, and one of the underlying disks failed.
  • I have identified the offending disk and am ready to act on it.
  • What steps must I follow to bring my system back to a healthy state, with no data loss?

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • mdadm

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