Hi Peng , This really depends on how you have configured your topology. Say if you have segregated your dc into 3 racks with 10 servers each. With RF of 3 you can safely assume your data to be available if one rack goes down.
But if different servers amongst the racks fail then i guess you are not guaranteeing data integrity with RF of 3 in that case you can at max lose 2 servers to be available. Best idea would be to plan failover modes appropriately and letting cassandra know of the same. Regards, Bhuvan On Mon, Jul 24, 2017 at 3:28 PM, Peng Xiao <2535...@qq.com> wrote: > Hi, > > Suppose we have a 30 nodes cluster in one DC with RF=3, > how many nodes can be down?can we tolerate 10 nodes down? > it seems that we are not able to avoid the data distribution 3 replicas > in the 10 nodes?, > then we can only tolerate 1 node down even we have 30 nodes? > Could anyone please advise? > > Thanks >
