Re: [Gluster-users] Volume with only one node

[Maxence Sartiaux]

Thank you everyone !

On Tue, 2016-10-25 at 14:27 +0530, Pranith Kumar Karampuri wrote:
> 
> 
> On Tue, Oct 25, 2016 at 2:07 PM, Oleksandr Natalenko
>  wrote:
> > Hello.
> > 
> > 25.10.2016 10:08, Maxence Sartiaux wrote:
> > > I need to migrate a old 2 node cluster to a proxmox cluster with
> > > a
> > > replicated gluster storage between those two (and a third
> > > arbitrer
> > > node).
> > > 
> > > Id like to create a volume with a single node, migrate the data
> > > on
> > > this volume from the old server and then reinstall the second
> > > server
> > > and add the second brick to the volume.
> > > 
> >  
> > If you have only 2 nodes in total, you may lower replica to replica
> > 1, reinstall another node, re-add bricks to form replica 2 and
> > repeat these steps for another node. No downtime and data migration
> > by hands needed. 
> 
> Just want to let you guys know that Kevin had bad experience doing
> add-bricks when VMs are online. We are still not able to recreate
> this bug. So I would advise you to do an offline migration for now.
>  
> > > I found no informations about creating a replicated volume with a
> > > single node, is it possible ?
> > > 
> >  
> > Yes, with "force" option, if you really need that.
> > 
> > > Also is it possible to add a third arbitrary node to an existing
> > > 2
> > > replica volume ?
> > > 
> >  
> > Yes, starting from v3.8.
> > 
> > Regards,
> >   Oleksandr
> > 
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> > Gluster-users@gluster.org
> > http://www.gluster.org/mailman/listinfo/gluster-users
> > 
> 
> 
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Re: [Gluster-users] Volume with only one node

[Pranith Kumar Karampuri]

On Tue, Oct 25, 2016 at 2:07 PM, Oleksandr Natalenko <
oleksa...@natalenko.name> wrote:

> Hello.
>
> 25.10.2016 10:08, Maxence Sartiaux wrote:
>
>> I need to migrate a old 2 node cluster to a proxmox cluster with a
>> replicated gluster storage between those two (and a third arbitrer
>> node).
>>
>> Id like to create a volume with a single node, migrate the data on
>> this volume from the old server and then reinstall the second server
>> and add the second brick to the volume.
>>
>
> If you have only 2 nodes in total, you may lower replica to replica 1,
> reinstall another node, re-add bricks to form replica 2 and repeat these
> steps for another node. No downtime and data migration by hands needed.


Just want to let you guys know that Kevin had bad experience doing
add-bricks when VMs are online. We are still not able to recreate this bug.
So I would advise you to do an offline migration for now.


>
> I found no informations about creating a replicated volume with a
>> single node, is it possible ?
>>
>
> Yes, with "force" option, if you really need that.
>
> Also is it possible to add a third arbitrary node to an existing 2
>> replica volume ?
>>
>
> Yes, starting from v3.8.
>
> Regards,
>   Oleksandr
>
> ___
> Gluster-users mailing list
> Gluster-users@gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
>



-- 
Pranith
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Re: [Gluster-users] Volume with only one node

[Oleksandr Natalenko]

Hello.

25.10.2016 10:08, Maxence Sartiaux wrote:

I need to migrate a old 2 node cluster to a proxmox cluster with a
replicated gluster storage between those two (and a third arbitrer
node).

Id like to create a volume with a single node, migrate the data on
this volume from the old server and then reinstall the second server
and add the second brick to the volume.


If you have only 2 nodes in total, you may lower replica to replica 1, 
reinstall another node, re-add bricks to form replica 2 and repeat these 
steps for another node. No downtime and data migration by hands needed.



I found no informations about creating a replicated volume with a
single node, is it possible ?


Yes, with "force" option, if you really need that.


Also is it possible to add a third arbitrary node to an existing 2
replica volume ?


Yes, starting from v3.8.

Regards,
  Oleksandr
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Re: [Gluster-users] Volume with only one node

[Kaushal M]

On Tue, Oct 25, 2016 at 1:38 PM, Maxence Sartiaux  wrote:
> Hello,
>
> I need to migrate a old 2 node cluster to a proxmox cluster with a
> replicated gluster storage between those two (and a third arbitrer node).
>
> Id like to create a volume with a single node, migrate the data on this
> volume from the old server and then reinstall the second server and add the
> second brick to the volume.
>
> I found no informations about creating a replicated volume with a single
> node, is it possible ?

This is possible.
You first create a single brick volume on the first server. Note that
this is not a replica volume right now.
# gluster volume create  :

After migration and re-installing the 2nd server, you add the new
server to the GlusterFS trusted pool.
# gluster peer probe 

And add a replica brick the volume you created earlier,
# gluster volume add-brick  replica 2 :


>
> Also is it possible to add a third arbitrary node to an existing 2 replica
> volume ?

I'm not sure this is possible yet. Krutika or Pranith can answer this.

>
> Thank you.
>
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[Gluster-users] Volume with only one node

[Maxence Sartiaux]

Hello, 

I need to migrate a old 2 node cluster to a proxmox cluster with a replicated 
gluster storage between those two (and a third arbitrer node). 

Id like to create a volume with a single node, migrate the data on this volume 
from the old server and then reinstall the second server and add the second 
brick to the volume. 

I found no informations about creating a replicated volume with a single node, 
is it possible ? 

Also is it possible to add a third arbitrary node to an existing 2 replica 
volume ? 

Thank you. 
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