Chapter 16. Using 2-way replication with CephFS

Procedure

1. Patch the storagecluster to change default CephFS data pool to replica-2.

   $ oc patch storagecluster ocs-storagecluster -n openshift-storage --type json --patch '[{ "op": "replace", "path": "/spec/managedResources/cephFilesystems/dataPoolSpec/replicated/size", "value": 2 }]'
   storagecluster.ocs.openshift.io/ocs-storagecluster patched

   $ oc get cephfilesystem ocs-storagecluster-cephfilesystem -o=jsonpath='{.spec.dataPools}' | jq
   [
     {
       "application": "",
       "deviceClass": "ssd",
       "erasureCoded": {
         "codingChunks": 0,
         "dataChunks": 0
       },
       "failureDomain": "zone",
       "mirroring": {},
       "quotas": {},
       "replicated": {
         "replicasPerFailureDomain": 1,
         "size": 2,
         "targetSizeRatio": 0.49
       },
       "statusCheck": {
         "mirror": {}
       }
     }
   ]

2. Check the pool details.

   $ ceph osd pool ls | grep filesystem
   ocs-storagecluster-cephfilesystem-metadata
   ocs-storagecluster-cephfilesystem-data0

Procedure

1. Click Storage StorageClasses Create Storage Class.
2. Select CephFS Provisioner.

3. Under Storage Pool, click Create new storage pool.

   1. Fill in the Create Storage Pool fields.
   2. Under Data protection policy, select 2-way Replication.
   3. Confirm Storage Pool creation
4. In the Storage Class creation form, choose the newly created Storage Pool.
5. Confirm the Storage Class creation.

Verification

1. Click Storage Data Foundation.
2. In the Storage systems tab, select the new storage system.
3. The Details tab of the storage system reflect the correct volume and device types you chose during creation