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.

Prerequisites

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:

~(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.

Procedure

Standard systems with controller storage

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

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

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

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

3. Power down controller-1.

4. Replace the storage disk.

5. Power on controller-1.

6. Unlock controller-1.

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

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

   ~(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
   

8. Ensure that the Ceph cluster is healthy.

   ~(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

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

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

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

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

3. Power down storage-1.

4. Replace the storage disk.

5. Power on storage-1.

6. Unlock storage-1.

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

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

   ~(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
   

8. Ensure that the Ceph cluster is healthy.

   ~(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