title: ceph-deploy for CentOS 7 does not find ceph-02:/dev/sdb file
body: <p>I am trying to activate ceph osd by following command:</p>
  
  <pre><code>ceph-deploy osd prepare ceph-02:/dev/sdb 
  </code></pre>
  
  <p>And found following error</p>
  
  <pre><code>[ceph-02][WARNIN] OSError: [Errno 2] No such file or directory: '/dev/sdb'
  
  [ceph-02][ERROR ] RuntimeError: command returned non-zero exit status: 1
  
  [ceph_deploy.osd][ERROR ] Failed to execute command: /usr/sbin/ceph-disk -v 
  prepare --cluster ceph --fs-type xfs -- /dev/sdb
  
  [ceph_deploy][ERROR ] GenericError: Failed to create 1 OSDs
  </code></pre>