Ceph - s able to show but other cluster status, it seems that is ceph cluster mon service startup failed, before this operation is carried out to do the hot standby of MDS, but now to stop all MDS services still couldn't start mon service, is a test cluster, a total of three machines, each decorated the osd, mon,

It looks like and are unable to connect to the cluster mon, but things of firewall is shut down, don't know how to solve, here to help you!