[Gluster-devel] Adding nodes

[Kevan Benson]

It looks like you are using the same brick in multiple AFR definitions, 
which won't work.  See 
http://www.gluster.org/docs/index.php/Mixing_Unify_and_Automatic_File_Replication 
for an example of what you look to be trying to do.

To answer your original question, files within an AFR are healed from 
one node to the other when the file is accessed (actually read) through 
the AFR and one node is found to have more recent data than others.

You can make sure a particular file is healed by running head -c1 on it 
(you can send the output to /dev/null if you like), and you can make 
sure a whole AFR is synced by running a find on it and executing head 
-c1 on all the files found.  See 
http://www.gluster.org/docs/index.php/Understanding_AFR_Translator for a 
more complete example and much more information.

Marcus Herou wrote:
> Hi.
> 
> I have a question regarding expanding a glusterfs system which
> probably been answered but still.
> 
> Lets say I use Unify over AFR and have 3 nodes where each file is
> replicated twice.
> 
> Probably first hand a client file like the one on the web.
> 
> volume brick1
>  type protocol/client
>  option transport-type tcp/client     # for TCP/IP transport
>  option remote-host 192.168.1.1      # IP address of the remote brick
>  option remote-subvolume brick        # name of the remote volume
> end-volume
> 
> volume brick2
>  type protocol/client
>  option transport-type tcp/client
>  option remote-host 192.168.1.2
>  option remote-subvolume brick
> end-volume
> 
> volume brick3
>  type protocol/client
>  option transport-type tcp/client
>  option remote-host 192.168.1.3
>  option remote-subvolume brick
> end-volume
> 
> volume brick-ns1
>  type protocol/client
>  option transport-type tcp/client
>  option remote-host 192.168.1.1
>  option remote-subvolume brick-ns
> end-volume
> 
> volume brick-ns2
>  type protocol/client
>  option transport-type tcp/client
>  option remote-host 192.168.1.2
>  option remote-subvolume brick-ns
> end-volume
> 
> volume afr1
>  type cluster/afr
>  subvolumes brick1 brick2
> end-volume
> 
> volume afr2
>  type cluster/afr
>  subvolumes brick2 brick3
> end-volume
> 
> volume afr-ns
>  type cluster/afr
>  subvolumes brick-ns1 brick-ns2
> end-volume
> 
> volume unify
>  type cluster/unify
>  option namespace afr-ns
>  option scheduler rr
>  subvolumes afr1 afr2
> end-volume
> 
> And after I add another node I add the following:
> 
> ....
> volume brick4
>  type protocol/client
>  option transport-type tcp/client
>  option remote-host 192.168.1.4
>  option remote-subvolume brick
> end-volume
> ....
> volume afr3
>  type cluster/afr
>  subvolumes brick3 brick4
> end-volume
> ....
> volume unify
>  type cluster/unify
>  option namespace afr-ns
>  option scheduler rr
>  subvolumes afr1 afr2 afr3
> end-volume
> 
> 
> So the question is really: Will the new node4 get the data from node3
> automatically ?
> 
> 
> I appreciate any answers.
> 
> Kindly
> 
> //Marcus
> 
> 
> 
> 
> 
> --
> Marcus Herou CTO and co-founder Tailsweep AB
> +46702561312
> marcus.herou at tailsweep.com
> http://www.tailsweep.com/
> http://blogg.tailsweep.com/
> 
> 
> _______________________________________________
> Gluster-devel mailing list
> Gluster-devel at nongnu.org
> http://lists.nongnu.org/mailman/listinfo/gluster-devel
> .
> 


-- 

-Kevan Benson
-A-1 Networks