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I have a machine running Ubuntu 12.10. It has 3 1TB drives running software RAID 5 (each drive has a main,and swap partition. 3x main partitions are raided and mounted as /, 3x swap partitions are raided and mounted as swap).

The raid is mounted at / (so the entire OS sits on the RAID array). Now since recent upgrade (12.04->12.10) the upgrade, the system has become really funky, slow & slugish, and exhibits some problems when booting. I don't have any custom configurations or settings i'm afraid of losing, except for the data itself (I don't time to find the root of the problem and it would be easiest and fastest if I just preform a clean install, otherwise I would probably investigate the root cause)

Is it possible to perform a clean install WITHOUT losing data?

(and if so, I asume using the alternative ISO, please correct me if i'm wrong)

I remember reading somewhere that a clean install in recent ubuntu versions would not override files in /home/ during install, is this true? Should I move files I wish to preserve to /home/? Can a clean install be performed on an existing array?

Also, If there are any pit-falls I should consider/plan ahead for, I'll be glad to know :)

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Why are you reinstalling? Just fix the problems. –  Michael Hampton Jan 29 '13 at 20:12
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A backup of important files is necessary regardless. –  schaiba Jan 29 '13 at 20:18
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Yes, it is, but fixing the problem is a better idea. You'll also have a chance to learn something. –  Hubert Kario Jan 29 '13 at 20:31
    
I specifically wrote I do not have time to find the root of the problem (even though I know I can). I'm in the middle of finals, re-installing will take less than an hour, while finding the problem and fixing it could easily take a few (depending on what's causing it). –  Ken Jan 30 '13 at 8:31
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