[CentOS] Raid 10 questions...2 drive

Jacob Bresciani jacob at aers.ca
Fri Sep 24 22:53:49 EDT 2010


On Fri, Sep 24, 2010 at 7:50 PM, Digimer <linux at alteeve.com> wrote:

> On 10-09-24 10:27 PM, Tom Bishop wrote:
> > I have been reading lots of stuff but trying to find out if a raid10
> > 2drive setup is any better/worse than a normal raid 1 setup....I have to
> > 1Tb drives for my data and a seperate system drive, I am only interested
> > in doing raid on my data...
> >
> >
> > So i setup my initial test like this....
> >
> > mdadm -v --create /dev/md0 --chunk 1024 --level=raid10 --raid-devices=2
> > /dev/sdb1 /dev/sdc1
> >
> >
> > I have also read about near and far but was going to play with this and
> > was wondering if anyone had any insights for 2 drives setup...Thanks...
>
> Raid 10 requires 4 drives. First you would make two RAID 0 arrays, then
> create a third array that is RAID 1 using the two RAID 0 arrays for it's
> devices.
>
>
This would be a RAID 0+1, stripped set's mirror together. RAID 1+0 is
mirrored disk sets stripped together.

http://en.wikipedia.org/wiki/RAID#Nested_.28hybrid.29_RAID

With only two drives, your option is RAID 1 (mirroring - proper
> redundancy) or RAID 0 (striping only - lose one drive and you lose *all*
> data).
>
> --
> Digimer
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-- 
Jacob Bresciani
Linux Systems Administrator
Advanced Ecommerce Research Systems / Terapeak
Cell: 250 418-5412
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