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Growing a RAID 1 array using mdadm

Submitted by specialj on Sat, 2008-05-31 04:36.

I suppose that growing a RAID 1 array is not very common but I had a client that wanted to go from a 2 disk array to a 3 disk array so that one disk could be rotated out periodically and kept off-site. Here were the steps:

  • mdadm --add /dev/mdX /dev/sdXX
    • This adds the partition to the array as a hot spare.
  • mdadm --grow /dev/mdX -n 3
    • This increases the number of disks from 2 to 3.
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