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From Jstaceyss <Jenniferstaceysouth...@gmail.com>
Subject Re: clustering architecture
Date Wed, 04 May 2016 11:08:50 GMT
Tim,

I'm not sure if you can help but this site with jms codes is ruining my
life. The responsibility of the actions of others is not being taken.
Please stop it. I am beginning to beg for help
On May 2, 2016 11:46 PM, "Tim Bain [via ActiveMQ]" <
ml-node+s2283324n4711461h93@n4.nabble.com> wrote:

> It's not possible to have a quorum (i.e. > 50%) in all scenarios when you
> only have two groupings and both of them could disappear entirely.  By
> definition, to have a quorum after the loss of one grouping, the lost
> grouping must be < 50% and the one that remains must be > 50%, so in the
> inverse situation you can't possibly have a quorum.  This is why three is
> typically the number used to ensure survivability of the loss of a single
> item (whether an "item" is a process, a host, a rack, or a datacenter).
> So
> either you need a third datacenter in a third location, or you need to put
> two groupings in a single geographic site (in separate buildings, for
> example, or different floors or rooms, or on the other side of town), and
> accept that you're sacrificing the ability to survive certain catastrophes
> in order to save the cost of locating the third datacenter somewhere
> geographically distant.
>
> Tim
>
> On Sun, May 1, 2016 at 8:37 AM, sekaijin <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4711461&i=0>>
> wrote:
>
> > Hi
> >
> > There is a little thing I do not understand in the election of the
> master.
> >
> > I have two geographic site (Paris, Versailles).
> > the quorum is (n / 2) +1
> > if I have two servers in each site
> > the quorum is (4/2) +1 = 3
> > so if I have a blackout on the site (eg fire) I do not have the quorum
> > because I have only two servers
> >
> > if I have two server on a site and on the other
> > the quorum is (3/2) +1 = 2
> > so if I have a blackout on first site (eg fire) I do not have a quorum
> > because I have only one server
> >
> > It is impossible to secure the cluster?
> >
> > A+JYT
> >
> >
> >
> > --
> > View this message in context:
> >
> http://activemq.2283324.n4.nabble.com/clustering-architecture-tp4711412p4711418.html
> > Sent from the ActiveMQ - User mailing list archive at Nabble.com.
> >
>
>
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