[Gluster-devel] Is it possible to setup a RAID 6 using GlusterFS?

[Anand Babu Periasamy]

Xavier, this sounds cool. Please keep me and John Mark in the loop. We
will make sure you are getting all the help you needed from Red Hat.
-ab

On Thu, Mar 29, 2012 at 11:29 PM, Xavier Hernandez
<xhernandez at datalab.es> wrote:
> Hello David,
>
>
>
> we aren't the core developers of GlusterFS, but we are developing a new
> translator that will be able to implement something similar to a RAID6. In
> fact it will be able to have a configurable level of redundacy. A redundancy
> of 1 is equivalent to RAID 5; a redundancy of 2 is equivalent to RAID 6; and
> higher levels of redundancy are supported.
>
>
>
> We are also trying to improve performance over replicate by using a new
> contention detection and locking mecanism, but no promises about that yet.
>
>
>
> We plan to begin internal tests soon. When we consider it stable, we will
> release a first beta.
>
>
>
> Xavi
>
> On 29.03.2012 17:14, Pascal wrote:
>
> Am Thu, 29 Mar 2012 11:02:38 -0400
> schrieb David Coulson <david at davidcoulson.net>:
>
> Sorry for confusion, I understood you wrong in the first place. Now I
> guess I know what you mean and I will think about it.
>
> Are there more suggestions or official plans from the GlusterFS
> developers?
>
> Not following. If you have a replica count of 3, you can lose two boxes in
> that group and still have access to all your data. It's more like a 3-way
> RAID-1 than anything like RAID-6. On 3/29/12 11:00 AM, Pascal wrote:
>
> Am Thu, 29 Mar 2012 10:47:38 -0400 schrieb David
> Coulson<david at davidcoulson.net>: Hello David, thanks for your quick reply. I
> already considered a replica count of 3 (and six servers at all, correct?),
> but the problem would still be that two hard drives from the same "replica
> group" were not allowed to fail at the same time.
>
> Try doing a distributed-replica with a replica count of 3. Not really
> 'RAID-6' comparable, but you can have two nodes fail without outage.
> http://download.gluster.com/pub/gluster/glusterfs/3.2/Documentation/AG/html/sect-Administration_Guide--Setting_Volumes-Distributed_Replicated.htmlOn
> 3/29/12 10:39 AM, Pascal wrote:
>
> Hello everyone, I would like to know if it is possible to setup a GlusterFS
> installation which is comparable to a RAID 6? I did some research in the
> community and several mailing lists and all I could find were the similar
> request from 2009
> (http://gluster.org/pipermail/gluster-users/2009-May/002208.html,
> http://www.gluster.org/community/documentation/index.ph/Talk:GlusterFS_Roadmap_Suggestions).
> I would just like to have a scenario where two GlusterFS nodes/servers,
> respectively their hard drives, could fail at the same time. Thanks in
> advance! Pascal _______________________________________________
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-- 
Anand Babu Periasamy
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Imagination is more important than knowledge --Albert Einstein