[Gluster-devel] Re: AFR + unify + namespace question

[Brandon Lamb]

On Sat, May 3, 2008 at 2:50 PM, Brandon Lamb <brandonlamb at gmail.com> wrote:
> I couldnt find anything related to this with a quick search.
>
> Lets take a case where we have 3 data servers, so we do AFR using
> unify. For unify we specify a namespace volume that exists on lets say
> server1.
>
> Ok so what happens when server1 goes down, now there is no namespace.
> What are the implications and is there a common solution to avoid
> this?

http://gluster.org/docs/index.php/Aggregating_Three_Storage_Servers_with_Unify

Ok so I started to attempt to create a 3 server 2 client setup. I
thought I would use 3 servers and i would only want 2 copies of files.
I thought to do this you needed afr + unify.

However, AFR uses the number of servers as the number of copies, so
even using 3 servers I dont see a reason to use unify? Wont it just
send every write to all 3 servers anyway? So what is unify doing in
the example?

Is that just a bad example that I am trying to follow?