Cinder pool showing down in cinder service-list command output.

Issue

• Cinder pool showing down in cinder service-list command output.

• After rebuilt the ceph cluster, Openstack detects storage backend as down.

  # cinder service-list
  +------------------+--------------------+------+---------+-------+----------------------------+-----------------+
  | Binary           | Host               | Zone | Status  | State | Updated_at                 | Disabled Reason |
  +------------------+--------------------+------+---------+-------+----------------------------+-----------------+
  | cinder-scheduler | hostgroup          | nova | enabled | up    | 2017-05-15T02:42:25.000000 | -               |
  | cinder-volume    | hostgroup@sas-pool | nova | enabled | down  | 2017-05-14T03:04:01.000000 | -               |
  | cinder-volume    | hostgroup@ssd-pool | nova | enabled | down  | 2017-05-14T03:04:01.000000 | -               |
  +------------------+--------------------+------+---------+-------+----------------------------+-----------------+