MSDOS partition tables allow either four primary partitions, or three primary partitions and multiple logical partitions. Plan your system carefully before you commit to this.
I'm only using two partitions per disk, so I've selected them both to be Primary partitions:
Select the partition to appear at the beginning of the free space. The location doesn't really matter, I just create the partitions sequentially from the beginning of the disk until the end.
Now cursor up to the "Use as" setting. The default is "Ext3 journaling file system". Under a single disk system, this may well be what we want, but since we want to mirror our disks, we will have to change this to be a RAID partition.
Select "physical volume for RAID"
This is going to be the partition that we wish to boot from, so make sure that you select the "Bootable flag" option to "on":
So, that is now complete. Now select remaining free space area on the disk and create a new partition, and set it to be swap space. The process for doing this is almost identical to that set out above, except that you should select "swap area" instead of "physical volume for RAID".
If you want to mirror your swap space, just create a second raid partition, instead.
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