[Gluster-users] Is this kind of VM replication possible with Glusterfs

[kausik pal]

Hi Pranith,

Thanks for the reply.

Yes, currently in Glusterfs you have to create a pair for bricks for
file/VM replication.

But can a new translator be created so that it can support the replication
as shown in the pictures attached.

The benefit for this kind of VM replication would be that we can add any
number of nodes (odd/even) and the Glusterfs internal mechanism would
rebalance the VM placement in such a way so that maximum number of VMs
would be available when a number of bricks/node fails.

Request you to let me know if you need any further information from my side.

Thanks

Kausik



On Fri, May 16, 2014 at 6:40 AM, Pranith Kumar Karampuri <
pkarampu at redhat.com> wrote:

> hi Kaushik,
>     Nice pictures :-). If I understand the pictures correctly, they are
> placed in a way which does not follow the kind of replication glusterfs
> provides at the moment. In glusterfs, bricks are in replication with each
> other. So if brick1 from node1, brick2 from node2 are in replication then
> all the files placed in brick1 will also be present in brick2 and so on.
> But in the pictures you shared that is not the case. Let me know if I did
> not understand the pictures correctly.
>
> Pranith
> ----- Original Message -----
> > From: "kausik pal" <kausikpal.1 at gmail.com>
> > To: gluster-users at gluster.org
> > Sent: Monday, May 12, 2014 9:46:30 PM
> > Subject: [Gluster-users] Is this kind of VM replication possible with
> Glusterfs
> >
> > Hi All,
> >
> > PFA the two diagrams describing placement of the VMs during normal
> condition
> > and condition after two node failure in 5 node set up (Each Node can
> host up
> > to 6 VMs due to memory constraints).
> >
> > My question is whether this kind of VM replication as shown in the
> attached
> > diagram is possible utilizing GlusterFS.
> >
> > The benefits of this kind of replication would be following :-
> >
> > 1. Any number of Hosts/Nodes can participate (Odd/Even) in the
> > infrastructure.
> >
> > 2. We can add odd number of Nodes to re-balance the VM placement.
> >
> > 3. After node failures the Maximum number of VMs that can run on the
> > remaining nodes can be calculated with the following formula(Which will
> be
> > higher w.r.t. Gluster replicated volumes in most of the cases):-
> >
> > Total No. of VMs running after node failure = ((Total No. of Nodes) -
> (No. of
> > failed Nodes)) * (Max. No. of VMs that can run per Node)
> >
> > The attached table gives a rough calculation on maximum number VMs that
> can
> > run after node failures.
> >
> >
> > Please let me know if you need any further information from my side.
> >
> > Thanks
> >
> > Kausik
> >
> >
> >
> > _______________________________________________
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> > Gluster-users at gluster.org
> > http://supercolony.gluster.org/mailman/listinfo/gluster-users
>
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