14장. 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