Appendix C: Using the ARC Utility ● 70● The ACU allows you to use drives of different sizes in a RAID 1 or RAID 0. However,during a build operation, only the smaller drive can be selected as the source drive.● When migrating from single volume to RAID 0, migrating from a larger drive to asmaller drive is allowed. However, the destination drive must be at least half thecapacity of the source drive.● It is not recommend that you migrate or build an array on Windows dynamic disks(volumes), as it will result in data loss.5 When you are finished, press Done.Managing ArraysSelect the Manage Arrays option to perform these tasks:● Rebuilding Arrays (next section)● Viewing Array Properties on page 70● Deleting Arrays on page 71● Enabling/Disabling Write Cache on page 71Rebuilding ArraysNote: Rebuilding applies to Fault Tolerant arrays (RAID 1) only.By replacing a failed drive of a RAID 1 array with a new drive, you can rebuild to get the arrayto Optimal status and assume fault tolerance. You can perform a rebuild in the following ways:Note: If no spare exists and a hard disk drive fails, you need to create a spare before you canrebuild an array. See Adding/Deleting Hot Spares on page 71 before continuing your rebuild.● System Shutdown RebuildYou can power off the computer and replace the failed drive with a new one (of equal orgreater capacity). When the system is booted, you can assign the new drive as a spare, andthis will start the Rebuild task. All the data from the good drive is copied to the new one,and the original RAID 1 array is recreated.● Manual Rebuilda From the Main Menu, select Manage Arrays. From the List of Arrays, select the arrayyou want to rebuild.b Press Ctrl+R to rebuild.Viewing Array PropertiesTo view the properties of an existing array:1 From the ACU menu, select Manage Arrays.2 From the List of Arrays dialog box, select the array you want to view, then press Enter.The Array Properties dialog box appears, showing detailed information on the array. Thephysical disks associated with the array are displayed here.3 Press Esc to return to the previous menu.
