I've hit a timeout issue on calls to ceph-disk activate. Initially, I followed the 'Storage Cluster Quick Start' on the CEPH website to get a cluster up and running. I wanted to tweak the configuration however and decided to blow away the initial setup using the purge / purgedata / forgetkeys commands with ceph-deploy. Next time around I'm getting a timeout error when attempting to activate an OSD on two out of the three boxes I'm using: [ceph_deploy.cli][INFO ] Invoked (1.5.15): /usr/bin/ceph-deploy osd activate hp10:/data/osd [ceph_deploy.osd][DEBUG ] Activating cluster ceph disks hp10:/data/osd: [hp10][DEBUG ] connected to host: hp10 [hp10][DEBUG ] detect platform information from remote host [hp10][DEBUG ] detect machine type [ceph_deploy.osd][INFO ] Distro info: CentOS Linux 7.0.1406 Core [ceph_deploy.osd][DEBUG ] activating host hp10 disk /data/osd [ceph_deploy.osd][DEBUG ] will use init type: sysvinit [hp10][INFO ] Running command: sudo ceph-disk -v activate --mark-init sysvinit --mount /data/osd [hp10][WARNIN] No data was received after 300 seconds, disconnecting... [hp10][INFO ] checking OSD status... [hp10][INFO ] Running command: sudo ceph --cluster=ceph osd stat --format=json This is on CentOS 7, ceph-deploy version is 1.5.15. The firewalld service is disabled, network connectivity should be good as the cluster previously worked on these boxes. Any suggestions where I should start looking to track down the root cause of the timeout?