Re: RAID 10 plug-in for EVMS?

On Nov 22, 2007 10:41 PM,  <[email protected]> wrote:
> Hi all,
>
> I understand from Neil Brown over on the linux-raid list that there is
> native RAID 10 support in Linux md. However, I am not aware of a RAID
> 10 plug-in for EVMS 2.5.5. As a result, I've been creating multiple
> RAID 1's and one RAID 0 whenever I want RAID 10. This is grossly
> inefficient and not particularly management friendly. For example, a
> RAID 10 with 8 drives would require 5 md devices using this approach.
> It of course seems like it would be much better to simply create one
> RAID 10.


You can get away with only 3 md devices, which would actually boost
your performance. You would make 2 RAID 0 arrays of 4 disks and then
create a RAID 1 using those 2 arrays as the 'disks'. The 2 striped
arrays would always be in sync.

It would look like this:
/dev/md0 ->|
                 | -> /dev/md2
/dev/md1 ->|

Where md0 and md1 are the RAID 0 sets with 4 drives each and md2 is
consuming md0 and md1 to make a RAID 1 set.


>
> Is there an EVMS plug-in for RAID 10?

No. See above. EVMS isn't maintained much anymore - this list is
basically dead. You might want to look into mdadm for handling the
creation of the arrays. You would still be able to manage them once
they are created, but by using mdadm you would not be tied to just
using evms in the future.

Just my 2 cents.
>
> I am running EVMS v2.5.5 on Linux 2.6.20.11 SMP 64-bit homebrew build.
>
> Thanks!
> Thomas
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-- 
Scott Kaelin
Sitrof Technologies
[email protected]

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