mdadm how to add additional RAID 1 drives

This is a great way to upgrade your RAID array or move it/copy it to a new set of hard drives.

Eg. you have a current RAID 1 array on older/slower drives.

Just add at least 1 of the new drives to the array, update grub/install it and then boot into it.  Then you have a transparent data migration that is fully synchronized.

 

mdadm --grow /dev/md126 --raid-devices 3


     
md127 : active raid1 sdc1[3] sdb1[0] sda1[1]
      153599936 blocks [3/2] [UU_]
      [>....................]  recovery =  0.8% (1281216/153599936) finish=119.7min speed=21202K/sec
 


Tags:

mdadm, additional, raid, drivesthis, upgrade, array, eg, slower, update, grub, install, transparent, migration, synchronized, dev, md, devices, active, sdc, sdb, sda, uu_, min,

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