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5.1.1. 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 each drive you wish to be part of the RAID array.
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.
A swap partition size of twice the available RAM capacity may not always be desirable, especially on systems with large amounts of RAM. Calculating the swap partition size for servers is highly dependent on how the system is going to be used.
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".