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

[John Mark Walker]

Xavier,

I missed this the first time around - this sounds really awesome. Please do let us know if you need any help.

Thanks!
JM


----- Original Message -----
> 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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> 
> 
> 
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> Anand Babu Periasamy
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