Gluster users - Sep 2015 - GlusterFS 3.7

Hi,

Are there any restrictions as to when I'm allowed to make changes to the
GlusterFS
volume (for instance: start/stop volume, add/remove brick or peer)? How will it
handle such changes when one of my two replicated servers is down? How will
GlusterFS
know which set of configuration files it can trust when the other server is
connected
again and the files will contain different information about the volume? If
these
were data files on the GlusterFS volume that would have been handled by the
extended
file attributes, but how about the GlusterFS configuration itself?

Regards
Andreas

glusterd should handle syncing any changes you make with the "gluster"
 command to the peers, obviously if you make local changes to the volume
file on one server you are likely to break things unless you copy rsync the
changes to the other server.

On 22 September 2015 at 04:02, Andreas Hollaus <Andreas.Hollaus at
ericsson.com
> wrote:
> Hi,
>
> Are there any restrictions as to when I'm allowed to make changes to
the
> GlusterFS
> volume (for instance: start/stop volume, add/remove brick or peer)? How
> will it
> handle such changes when one of my two replicated servers is down? How
> will GlusterFS
> know which set of configuration files it can trust when the other server
> is connected
> again and the files will contain different information about the volume?
> If these
> were data files on the GlusterFS volume that would have been handled by
> the extended
> file attributes, but how about the GlusterFS configuration itself?
>
> Regards
> Andreas
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
>
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Hi Andreas,
>> Are there any restrictions as to when I'm allowed to make changes
to the GlusterFS
volume (for instance: start/stop volume, add/remove brick or peer)?

There are no restriction to make changes to the GlusterFS volume its all depend
on your need whether you want to start/stop volume, add/remove brick or peer.
>> How will it handle such changes when one of my two replicated servers
is down?
When one of the replicated server is down then it will lookup to another server
which is online, and if you do any file operation from mount point it will be
reflected to the replica count which is currently online. When second replica
come back online then you can start heal operation on glusterFS volume, it will
update the 2nd replica which was offline.
>> How will GlusterFS know which set of configuration files it can trust
when the other server is connected
again and the files will contain different information about the volume?

When other node (server) come online then it will do handshake with the node
which was online and request for configuration file and the offline node which
come back online will update the configuration file based on the updated
configuration file it received. But you should not flout glusterFS configuration
by editing volfile manually to avoid obscure behavior.

I hope that will answer your doubt.

Thank you...

Regards,
Gaurav Garg
 

----- Original Message -----
From: "Andreas Hollaus" <Andreas.Hollaus at ericsson.com>
To: gluster-users at gluster.org
Sent: Tuesday, September 22, 2015 1:32:08 PM
Subject: [Gluster-users] GlusterFS 3.7

Hi,

Are there any restrictions as to when I'm allowed to make changes to the
GlusterFS
volume (for instance: start/stop volume, add/remove brick or peer)? How will it
handle such changes when one of my two replicated servers is down? How will
GlusterFS
know which set of configuration files it can trust when the other server is
connected
again and the files will contain different information about the volume? If
these
were data files on the GlusterFS volume that would have been handled by the
extended
file attributes, but how about the GlusterFS configuration itself?

Regards
Andreas

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