Neil Brown <neilb@suse.de> writes:

quoted text
> On Sat, 06 Mar 2010 18:17:44 -0500
> "Guy Watkins" <linux-raid@watkins-home.com> wrote:
>
>> } 
>> } At a minimum I would build a 3-disk raid 6.  raid 6 does a lot of i/o
>> } which may be a problem.
>> 
>> If he only needs 3 drives I would recommend RAID1.  Can still loose 2 drives
>> and you don't have the RAID6 I/O overhead.
>> 
>
> and as md/raid6 requires at least 4 drives, RAID1 is not just the best
> solution to survive two failures on a 3-device array, it is the only solution.
>
> NeilBrown

Except that there also is raid10 with 3 mirrors. :)

MfG
        Goswin

PS: Why doesn't raid6 still not allow 3 drives for the special case of
converting raid1 -> raid6?


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