Ok, I understand, so I'll create a new mon to permit me stop the mon.a. Thanks, Fran.
2016-07-07 17:46 GMT+02:00 Joao Eduardo Luis <[email protected]>: > On 07/07/2016 04:39 PM, Fran Barrera wrote: > >> Yes, this is the problem. >> > > Well, you lose quorum once you stop A. > > As the docs clearly state, you cannot tolerate failures if you have just > two monitors. > > If your cluster only has two monitors, you cannot form quorum with just > one monitor: you need a majority up, running and able to communicate among > themselves. > > Simply put, you need at least (n+1)/2 monitors up for a quorum to be > formed, 'n' being the total number of monitors in the cluster (i.e., in the > monmap). > > You either need A and B to be running to be able to use the quorum, or you > need to add another monitor (call it C) so that you can stop A and still > have the cluster working. > > -Joao > > >> 2016-07-07 17:34 GMT+02:00 Joao Eduardo Luis <[email protected] >> <mailto:[email protected]>>: >> >> On 07/07/2016 04:31 PM, Fran Barrera wrote: >> >> Hello, >> >> Yes I've added two monitors but the error persist. In the error >> I see >> only the IP of the first mon, why not appears the second? >> >> >> The description you offered on the initial email appears to state >> the following: >> >> - You initially had one monitor (let's call it A) >> - You added a second monitor (let's call it B) >> - Everything works while A and B are running >> - Nothing works if you stop A >> >> Did I understand your problem correctly? >> >> -Joao >> >> >> I had only one monitors before and running good because I have >> installed >> AIO. >> >> Thanks. >> >> 2016-07-07 17:22 GMT+02:00 Joao Eduardo Luis <[email protected] >> <mailto:[email protected]> >> <mailto:[email protected] <mailto:[email protected]>>>: >> >> >> >> On 07/07/2016 04:17 PM, Fran Barrera wrote: >> >> Hi all, >> >> I have a cluster setup AIO with only one monitor and >> now I've >> created >> another monitor in other server following this doc >> http://docs.ceph.com/docs/master/rados/operations/add-or-rm-mons/ >> but >> my >> problem is if I stop the AIO monitor, the cluster stop >> working. >> It seems >> like the ceph is not updated with the new mon or >> something >> >> >> In the doc you quoted, one can read: >> >> "Due to the nature of Paxos, Ceph requires a majority of >> monitors >> running to establish a quorum (thus establishing consensus). >> >> [...] >> >> For instance, on a 2 monitor deployment, no failures can be >> tolerated in order to maintain a quorum; with 3 monitors, one >> failure can be tolerated; [...]" >> >> And in a box beneath, you also see >> >> "Note: A majority of monitors in your cluster must be able >> to reach >> each other in order to establish a quorum." >> >> >> So, say you have 2 monitors and you need a majority of them >> to be >> up, running, and able to communicate with each other in >> order to >> form quorum. What's a majority of 2? How many failures can >> you tolerate? >> >> -Joao >> >> >> >> >> _______________________________________________ >> ceph-users mailing list >> [email protected] <mailto:[email protected]> >> <mailto:[email protected] >> <mailto:[email protected]>> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >> >> >> >
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