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How to set up RAID 1 [software, hardware or fake] on Ubuntu 12.04 desktop?

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Why the down-votes? This looks like a decent question & I didn't find any exact dupes. +1 from me. –  Tom Brossman Jun 29 '12 at 19:35
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RAID 1 is mirroring; where data is duplicated on two different drives using either a hardware RAID controller or software (via the operating system). If either drive fails, the other continues to function as a single drive until the failed drive is replaced.

First thing that needs to be done is to install mdadm. To do so

Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command below.

apt-get install mdadm 

Or use USC

Once that is done,

Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command below.

mdadm

--create creates a new RAID device

and follow the instructions

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If you want to install on a boot volume with RAID, you can't use the desktop install CD. You need to use the "alternate install" CD:

http://www.ubuntu.com/download/desktop/alternative-downloads

Inside that installer you'll have the options to create a RAID (MD) device and/or use LVM.

https://help.ubuntu.com/community/Installation#Installing_on_external_or_RAID_hard_disks

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