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Re: Software RAID5

Jose Fonseca <j_r_fonseca@yahoo.co.uk> writes:

> On Sun, 28 May 2006 13:00:19 +0200, Jean-Luc Coulon (f5ibh) wrote:
>> Hi,
>> I've a system with a software raid1 on 2 sata drive 80 GB
>> I've all my system on LVM on this underlying raid.
>> For performances reasons (video editing), I'm thinking if a RAID5.
>> Is there somebody with some experience with raid5:
>> - performances
>> - behaviour in case of a crash
>> Is there an easy process to migrate from raid1 to raid5 without  
>> reinstalling everything?
>> Regards
>> Jean-Luc
> I managed to switch from a 2x200Gb RAID-0 to a 3x200Gb RAID-5 without
> reinstalling using raidreconf <http://unthought.net/raidreconf/> on my
> AMD64.
> I'm still amazed it work flawlessly, as latest raidreconf dates from 2001!
> Obviously I backed-up everything before, but I didn't need used it.
> Although I ran in a Amd64, I compiled raidreconf as a 32-bit application,
> since I was afraid it wasn't 64-bit clean.
> Then it's a matter of writing two raidtabs -- one describing the
> current raid setup, and another describing the desired setup -- and run
> raidreconf.
> José Fonseca

Recent kernels and mdadm have support for rebuilding a raid
now. Better to use that where possible.


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