Enlarging a RAID1 Array

You can use hot swapping to enlarge a RAID1 array. For example, assume you have two hard drives, HDD1 and HDD2, in a RAID1 mirroring configuration and in optimal state. The capacity of HDD1 and HDD2 is 500GB each, meaning the array size is 500GB. You can enlarge the array to 1TB as follows:

1. Hot swap HDD1, replacing it with a 1TB hard drive as described in Hot Swapping a Disk in a RAID1, 5, or 6 Array.
2. Wait until the array's status is optimal.
3. Hot swap HDD2, replacing it with a 1TB hard drive as described in Hot Swapping a Disk in a RAID1, 5, or 6 Array.
4. Wait until the array's status is optimal.

   The array will now be 1TB in size.

   You can now enlarge volumes on the array to fill the available space, or add new volumes.