I have some basic question about monitor and paxos relationship:
As the documents says, Ceph monitor contains cluster map, if there is any
change in the state of the cluster, the change is updated in the cluster map.
monitor use paxos algorithm to create the consensus among monitors to establish
a quorum.
And when we talk about the Paxos algorithm, documents says that monitor writes
all changes to the Paxos instance and Paxos writes the changes to a key/value
store for strong consistency.
#1: I am unable to understand what actually the Paxos algorithm do? all changes
in the cluster map are made by Paxos algorithm? how it create a consensus among
monitors
My assumption is: cluster map is updated when OSD report monitor about any
changes, there is no role of Paxos in it. Paxos write changes made only for the
monitors. Please somebody elaborate at this point.
#2: why odd no. of monitors are recommended for production cluster, not even
no.?
Please help me to clarify these points.
Regards
Pragya Jain
_______________________________________________
ceph-users mailing list
ceph-users@lists.ceph.com
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
