HOWTO convert system to use software raid.

FAQ software raid system, on production server.

LINUX SOFTWARE RAID MDADM HOWTO

How to convert a production system to software raid, remotely, using mdadm.

I spent 3 months figuring out the steps. out.

And then 6 more months fixing the documentation as people submit erratta...

This document is the current online help for debian software raid software package mdadm.

madm, mdadm file list

You do not need a rescue disk or to boot off anything except the hard drive.

You can do this operation completely remotely.

You will not lose any data in this conversion.


To the best of my knowledge this is the most complete and comprehensive and step by step manual on converting a system to use software raid. It has had numerous improvements made to by the thousands of people that have used it worldwide.

Contact me with ANY ERRORS YOU FIND!

I WILL FIX AN GRAMMAR/SPELLING ERRORS YOU SUBMIT.

I'm not converting it to docbook or sgml format as I dont' want to spend any time formatting. This document works as a text and as an xml/html document.

I LOVE TO HEAR FROM PEOPLE THAT USE THIS DOCUMENT!

If you make signifigant changes please submit as a unified patch:

diff -u original_version.html newversion.html

if you make the improvement.

This only covers using mdadm. Mdadm is easier to use than raidtools or raidtools2.
GRAB THE DOCUMENT: https://alioth.debian.org/projects/rootraiddoc/

Read the whole document before you start doing it.

Backup your data first.

Test it on on a non production system so you understand what you are doing. 

I'm too busy to help you if you fsck yourself.

Instructions will work on any linux. 

These instructions are currently included in the debian mdadm package.

Contact me with questions or improvements:

or cvs it out and make your own improvements https://alioth.debian.org/scm/?group_id=1405

admin \a\ cs.montana.edu