Software RAID-5 is a cheap and easy way to create a virtual single drive from many to store your files. Software RAID in Linux, via mdadm, offers lots of advanced features that are only normally available on harware RAID controller cards. A big one is the ability to ‘grow’ the array of disks when you run out of space! Consider also that software RAID can move with you – so if you decide to change motherboards or your RAID controller fails it is won’t mean the end of the world.
This guide details setting up software RAID 5 on Hardy Heron (8.04) Ubuntu using mdadm after you have a running Ubuntu install. It does not cover everything you need to know about RAID and the knowledge in this document is by no means extensive – please check out the further reading link for more information at the end of this article.
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