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Setting Up Raid 1 On Ubuntu 10.04

The following has been distilled from https://help.ubuntu.com/10.04/serverguide/C/advanced-installation.html and revised to match our operating process.

Partitioning

Follow the installation steps until you get to the Partition disks step, then:

  1. Select Manual as the partition method.
  2. Select the first hard drive, and agree to “Create a new empty partition table on this device?”.
    • Repeat this step for the second drive.
  3. Select the “FREE SPACE” on the first drive then select “Create a new partition”.
  4. Next, select the Size of the partition. This partition will be the swap partition, and a general rule for swap size is twice that of RAM. Enter the partition size, then choose Primary, then Beginning.
  5. Select the “Use as:” line at the top. By default this is “Ext4 journaling file system”, change that to “physical volume for RAID” then “Done setting up partition”.
  6. For the / partition once again select “Free Space” on the first drive then “Create a new partition”.
  7. Use the rest of the free space on the drive and choose Continue, then Primary.
  8. As with the swap partition, select the “Use as:” line at the top, changing it to “physical volume for RAID”. Also select the “Bootable flag:” line to change the value to “on”. Then choose “Done setting up partition”.

RAID Configuration

With the partitions setup the arrays are ready to be configured:

  1. Back in the main “Partition Disks” page, select “Configure Software RAID” at the top.
  2. Select “yes” to write the changes to disk.
  3. Choose “Create MD device”.
  4. Select “RAID1”
  5. Enter the number of active devices “2”, or the amount of hard drives you have, for the array. Then select “Continue”.
  6. Next, enter the number of spare devices “0” by default, then choose “Continue”.
    • Choose which partitions to use. Generally they will be sda1, sdb1
    • For the swap partition choose sda1 and sdb1. Select “Continue” to go to the next step.
  7. Repeat steps three through seven for the / partition choosing sda2 and sdb2.
  8. Once done select “Finish”.

Formatting

There should now be a list of hard drives and RAID devices. The next step is to format and set the mount point for the RAID devices. Treat the RAID device as a local hard drive, format and mount accordingly.

  1. Select “#1” under the “RAID1 device #0” partition.
  2. Choose “Use as:”. Then select “swap area”, then “Done setting up partition”.
  3. Next, select “#1” under the “RAID1 device #1” partition.
  4. Choose “Use as:”. Then select “Ext4 journaling file system”.
  5. Then select the “Mount point” and choose “/ – the root file system”. Change any of the other options as appropriate, then select “Done setting up partition”.
  6. Finally, select “Finish partitioning and write changes to disk”.
  7. The installer will then ask if you would like to boot in a degraded state, select Yes.