[Gluster-devel] metdata-volume for gluster

[Niels de Vos]

On Wed, Apr 08, 2015 at 06:25:54AM -0400, Rajesh Joseph wrote:
> 
> 
> ----- Original Message -----
> > From: "Niels de Vos" <ndevos at redhat.com>
> > To: "Rajesh Joseph" <rjoseph at redhat.com>
> > Cc: "Gluster Devel" <gluster-devel at gluster.org>
> > Sent: Wednesday, April 8, 2015 12:40:14 AM
> > Subject: Re: [Gluster-devel] metdata-volume for gluster
> > 
> > On Tue, Apr 07, 2015 at 06:26:23AM -0400, Rajesh Joseph wrote:
> > > Hi all,
> > > 
> > > In gluster 3.7 multiple features (Snapshot scheduler, NFS Ganesha,
> > > Geo-rep) are planning to use additional volume to store metadata
> > > related to these features. This volume needs to be manually created
> > > and explicitly managed by an admin.
> > > 
> > > I think creating and managing these many metadata volume would be an
> > > overhead for an admin. Instead of that I am proposing to have a single
> > > unified metata-volume which can be used by all these features.
> > 
> > That sounds like a great idea!
> > 
> > > For simplicity and easier management we are proposing to have a
> > > pre-defined volume name.
> > 
> > Who is the "we" you speak about? It would be nice to know who gave their
> > opinions before you wrote this email. (I assume they would not respond
> > to this email because they have agreed already?)
> 
> We means Snapshot team and RHSC team, which needs this for better synchronization.
> Apart from this we had discussion with Geo-rep team and NFS team.
> 
> > 
> > > If needed this name can be configured using a global gluster option.
> > 
> > I would say that configuring is not needed, and surely not advised. A
> > name that is easy to recognise would be good, like prepending with a _.
> 
> Personally I also prefer to keep it fixed and not configurable. Which will
> reduce lot of communication and synchronization issues. 
> 
> As you suggested we can have the volume name start with "_". Vijay also
> had a similar suggestion. 
> 
> > 
> > > Please let me know if you have any suggestions or comments.
> > 
> > What would be the (default) name of this volume that you are thinking
> > about?
> 
> We have not finalized the name yet, may be something like _gf_meta_volume_.

Okay, sounds good to me. But please dont add a trailing _ or "volume" in
the name :-)

Thanks,
Niels