.. _replace-osds-on-a-standard-system-f3b1e376304c:

=================================
Replace OSDs on a Standard System
=================================

You can replace |OSDs| in a standard system to increase capacity, or replace
faulty disks on the host without reinstalling the host.

.. rubric:: |prereq|

For standard systems with controller storage, ensure that the controller with the |OSD| to be replaced is the standby controller.

For example, if the disk replacement has to be done on controller-1 and it is the active controller, use the following command to swact the controller to controller-0:

.. code-block:: none

    ~(keystone_admin)$ system host-swact controller-1

After controller swact, you will have to connect via ssh again to the <oam-floating-ip> to connect to the newly active controller-0.

.. rubric:: |proc|

**Standard systems with controller storage**

#.  If controller-1 has the OSD to be replaced, lock it.

    .. code-block:: none

        ~(keystone_admin)$ system host-lock controller-1

#.  Run the :command:`ceph osd destroy osd.<ID> --yes-i-really-mean-it` command.

    .. code-block:: none

        ~(keystone_admin)$ ceph osd destroy osd.<id> --yes-i-really-mean-it

#.  Power down controller-1.

#.  Replace the storage disk.

#.  Power on controller-1.

#.  Unlock controller-1.

    .. code-block:: none

        ~(keystone_admin)]$ system host-unlock controller-1

#.  Wait for the recovery process in the Ceph cluster to start and finish.

    .. code-block:: none

        ~(keystone_admin)]$ ceph -s

        cluster:
          id:     50ce952f-bd16-4864-9487-6c7e959be95e
          health: HEALTH_WARN
          Degraded data redundancy: 13/50 objects degraded (26.000%), 10 pgs degraded

        services:
          mon: 1 daemons, quorum controller (age 68m)
          mgr: controller-0(active, since 66m)
          mds: kube-cephfs:1 {0=controller-0=up:active} 1 up:standby
          osd: 2 osds: 2 up (since 9s), 2 in (since 9s)

        data:
          pools:   3 pools, 192 pgs
          objects: 25 objects, 300 MiB
          usage:   655 MiB used, 15 GiB / 16 GiB avail
          pgs:     13/50 objects degraded (26.000%)
                   182 active+clean
                   8   active+recovery_wait+degraded
                   2   active+recovering+degraded

        io:
          recovery: 24 B/s, 1 keys/s, 1 objects/s

#.  Ensure that the Ceph cluster is healthy.

    .. code-block:: none

        ~(keystone_admin)]$ ceph -s

        cluster:
          id:     50ce952f-bd16-4864-9487-6c7e959be95e
          health: HEALTH_OK

        services:
          mon: 1 daemons, quorum controller (age 68m)
          mgr: controller-0(active, since 66m), standbys: controller-1
          mds: kube-cephfs:1 {0=controller-0=up:active} 1 up:standby
          osd: 2 osds: 2 up (since 36s), 2 in (since 36s)

        data:
          pools:   3 pools, 192 pgs
          objects: 25 objects, 300 MiB
          usage:   815 MiB used, 15 GiB / 16 GiB avail
          pgs:     192 active+clean

**Standard systems with dedicated storage nodes**

#.  If storage-1 has the OSD to be replaced, lock it.

    .. code-block:: none

        ~(keystone_admin)$ system host-lock storage-1

#.  Run the :command:`ceph osd destroy osd.<ID> --yes-i-really-mean-it` command.

    .. code-block:: none

        ~(keystone_admin)$ ceph osd destroy osd.<id> --yes-i-really-mean-it

#.  Power down storage-1.

#.  Replace the storage disk.

#.  Power on storage-1.

#.  Unlock storage-1.

    .. code-block:: none

        ~(keystone_admin)]$ system host-unlock storage-1

#.  Wait for the recovery process in the Ceph cluster to start and finish.

    .. code-block:: none

        ~(keystone_admin)]$ ceph -s

        cluster:
          id:     50ce952f-bd16-4864-9487-6c7e959be95e
          health: HEALTH_WARN
          Degraded data redundancy: 13/50 objects degraded (26.000%), 10 pgs degraded

        services:
          mon: 1 daemons, quorum controller (age 68m)
          mgr: controller-0(active, since 66m)
          mds: kube-cephfs:1 {0=controller-0=up:active} 1 up:standby
          osd: 2 osds: 2 up (since 9s), 2 in (since 9s)

        data:
          pools:   3 pools, 192 pgs
          objects: 25 objects, 300 MiB
          usage:   655 MiB used, 15 GiB / 16 GiB avail
          pgs:     13/50 objects degraded (26.000%)
                   182 active+clean
                   8   active+recovery_wait+degraded
                   2   active+recovering+degraded

        io:
          recovery: 24 B/s, 1 keys/s, 1 objects/s

#.  Ensure that the Ceph cluster is healthy.

    .. code-block:: none

        ~(keystone_admin)]$ ceph -s

        cluster:
          id:     50ce952f-bd16-4864-9487-6c7e959be95e
          health: HEALTH_OK

        services:
          mon: 1 daemons, quorum controller (age 68m)
          mgr: controller-0(active, since 66m), standbys: controller-1
          mds: kube-cephfs:1 {0=controller-0=up:active} 1 up:standby
          osd: 2 osds: 2 up (since 36s), 2 in (since 36s)

        data:
          pools:   3 pools, 192 pgs
          objects: 25 objects, 300 MiB
          usage:   815 MiB used, 15 GiB / 16 GiB avail
          pgs:     192 active+clean