Gluster users - May 2014 - 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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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 mailing list
> Gluster-users at gluster.org
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