How to recover software RAID (RAID 1) when /dev/sda , which is a boot device is replaced

Solution Verified - Updated -

Issue

  • My system uses /dev/sda and /dev/sdb as software raid1
    • /dev/sda was broken and replaced
    • After that, my system can not boot up.
    • How can we recover software RAID (RAID 1) when /dev/sda, which is a boot device is replaced?
    • There is a sfdisk result of /dev/sda.

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 4

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