Re: Software RAID5
Goswin von Brederlow wrote:
> 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.
>
> MfG
> Goswin
>
>
To say.. move from RAID1 to RAID6? I wasn't aware, seeing that the
number of devices changes, and the filesystem has to be modified. Cool
if true. I'll go rtfm.
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