• RAID0 is simple — you will be issued with the list of available RAID partitions and your only task is to select the partitions which will form the MD. If you want to know more about Software RAID, have a look at Software RAID HOWTO (http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html). To create an MD device, you need to have the desired partitions it should consist of marked for use in a RAID. (This is done in partman in the Partition settings menu where you should select Use as: −→ physical volume for RAID .) Note: Make sure that the system can be booted with the partitioning scheme you are planning. In general it will be necessary to create a separate file system for /boot when using RAID for the root ( / ) file system. Most boot loaders do support mirrored (not striped!) RAID1, so using for example RAID5 for / and RAID1 for /boot can be an option. Next, you should choose Configure software RAID from the main partman menu. (The menu will only appear after you mark at least one partition for use as physical volume for RAID .) On the first screen of mdcfg simply select Create MD device . You will be presented with a list of supported types of MD devices, from which you should choose one (e.g. RAID1). What follows depends on the type of MD you selected. Type Minimum Devices Spare Device Survives disk failure? Available Space RAID0 2 no no Size of the smallest partition multiplied by number of devices in RAID RAID1 2 optional yes Size of the smallest partition in RAID RAID5 3 optional yes Size of the smallest partition multiplied by (number of devices in RAID minus one) RAID6 4 optional yes Size of the smallest partition multiplied by (number of devices in RAID minus two) RAID10 2 optional yes Total of all partitions divided by the number of chunk copies (defaults to two) Chapter 6. Using the Ubuntu Installer 57