Reviewed-by: Steven Dake <sdake@xxxxxxxxxx> On 01/13/2012 12:54 AM, Fabio M. Di Nitto wrote: > On 1/12/2012 7:17 PM, David Teigland wrote: > >>>> It's a free-for-all without a list of allowed nodes. >>> >>> I think i can understand your use case here, but my question is why is >>> quorum in charge of that? >> >> My point here is not about quorum (although this helps us when we do talk >> about quorum.) This is just about defining what the cluster is. > > I understand what you want, but what I don´t understand is how it helps > quorum (see below). > >> >>> Remember that this is not cman and that cman >>> had 2 functions, one of membership management (that's the one you are >>> really looking for, by allow/disallow a node) and quorum (calculated >>> after membership management has kicked in). >> >> Right, both are important. >> >>>> Maybe that's an important point that we've not drawn out yet. The list of >>>> nodes also operates as a "permission list". Any node that's not listed >>>> cannot join the cluster. I don't need to worry about some random or old >>>> node coming along and intruding. >>> >>> If anything, this has to happen either before quorum (at totem level or >>> in between), or at a much higher level (application that care do it >>> basically) since corosync doesn't really care, nor does pacemaker or the >>> quorum module. >> >> I'm trying to make the argument that a node list is a good thing by >> itself, apart from the benefits it has for quorum. > > Same here.... > > I am not arguing that your point is valid or not (nodelist, membership > management etc). What I don´t understand, and that makes me think that I > am missing a use case, is (always put aside one second the > expected_votes use case, we discussed at length and we don´t disagree > there): > > why is a nodelist *technically* important for quorum? > how does quorum benefits from this list? > how should this list be used by quorum? > > In several emails you write that the list is important/vital/etc. for > quorum, but I am not getting it.. i simply don´t understand what you are > trying to communicate me and I´d really like to understand and in case > fix the code. > > Fabio > _______________________________________________ > discuss mailing list > discuss@xxxxxxxxxxxx > http://lists.corosync.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list discuss@xxxxxxxxxxxx http://lists.corosync.org/mailman/listinfo/discuss
