md RAID10 questions

Hi Folks,

As far as I can tell, md RAID10 is the greatest thing since sliced bread
- mirroring and striping in one operation (more efficient disk use,
better performance), avoids the RAID5/6 write hole issue, etc. - I've
been having very good luck with it on two servers that I run.

The thing is, I'm looking at some scaling and clustering options, and
can find practically no documentation or case studies or much of any
information about md RAID10 - which sort of surprises me. I'd think it
would be more popular and there'd be more comparisons vis-a-vis other
options.

Anyway... what I'm looking at is trying to create a large storage pool,
out of 16 drives, spread across 4 servers - essentially trying to create
a poor man's storage cloud to support a collection of VMs that can be
migrated for load leveling and failover.

One thought is to expose all the drives via AoE, then combine them into
one large RAID10 array - but I'm neither sure this is feasible nor how
it would perform under various loads, failure conditions, etc.

Thoughts, pointers, ....?

Thanks,

Miles Fidelman

--
In theory, there is no difference between theory and practice.
In practice, there is. .... Yogi Berra


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Re: md RAID10 questions

On Mon, Oct 10, 2011 at 05:37:03PM -0400, Miles Fidelman wrote:
> Hi Folks,
>
> As far as I can tell, md RAID10 is the greatest thing since sliced bread
> - mirroring and striping in one operation (more efficient disk use,
> better performance), avoids the RAID5/6 write hole issue, etc. - I've
> been having very good luck with it on two servers that I run.
>
> The thing is, I'm looking at some scaling and clustering options, and
> can find practically no documentation or case studies or much of any
> information about md RAID10 - which sort of surprises me. I'd think it
> would be more popular and there'd be more comparisons vis-a-vis other
> options.
>
> Anyway... what I'm looking at is trying to create a large storage pool,
> out of 16 drives, spread across 4 servers - essentially trying to create
> a poor man's storage cloud to support a collection of VMs that can be
> migrated for load leveling and failover.
>
> One thought is to expose all the drives via AoE, then combine them into
> one large RAID10 array - but I'm neither sure this is feasible nor how
> it would perform under various loads, failure conditions, etc.
>
> Thoughts, pointers, ....?

there was some bencmarks on our wiki, but it is gone because kernel.org is down.

Any ideas how to remedy the wiki problem?

Best regards
keld
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Re: md RAID10 questions

keld@keldix.com wrote:
> there was some bencmarks on our wiki, but it is gone because kernel.org is down.
>
> Any ideas how to remedy the wiki problem?
>
Been wondering about that. It's been a while now. Sigh...


--
In theory, there is no difference between theory and practice.
In practice, there is. .... Yogi Berra


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