anchor.diff:        storage: 2Gi <2>
   
   ----
  -<1> As mentioned above for PVs, the `*accessModes*` do not enforce access right,
  -but rather act as labels to match a PV to a PVC.
  -<2> This claim will look for PVs offering *2Gi* or greater capacity.
  -====
  -
  -Save the definition to a file, for example *_ceph-claim.yaml_*, and create the
  +<1> The `*accessModes*` do not enforce access right, but instead act as labels to match a PV to a PVC.
  +<2> This claim looks for PVs offering `*2Gi*` or greater capacity.
  +====
  +
  +. Save the definition to a file, for example *_ceph-claim.yaml_*, and create the
   PVC:
  -
  ++
   ====
   ----
   # oc create -f ceph-claim.yaml
  
positive.code: 
  == Overview
  
  OpenShift clusters can be provisioned with
  link:../../architecture/additional_concepts/storage.html[persistent storage]
  using Ceph RBD. Persistent volumes (PVs) and persistent volume claims (PVCs) provide
  a convenient method for sharing a volume across a project. While the
  Ceph RBD specific information contained in a PV definition could also be defined
  directly in a pod definition, doing so does not create the volume as a distinct
  cluster resource, making the volume more susceptible to conflicts.
  
  This topic covers the specifics of using the Ceph RBD persistent storage type. Some
  familiarity with OpenShift and
  https://access.redhat.com/products/red-hat-ceph-storage[Ceph RBD] is beneficial.
  See the
  link:../../architecture/additional_concepts/storage.html[Persistent Storage]
  concept topic for details on the OpenShift persistent volume (PV) framework in general.
  
  [NOTE]
  ====
  
negative.code: [[ceph-provisioning]]
  == Provisioning
  
  To provision Ceph volumes, the following are required:
  
  - An existing storage device in your underlying infrastructure.
  - The Ceph key to be used in an {product-title} secret object.
  - The Ceph image name.
  - The file system type on top of the block storage (e.g., ext4).
  - *ceph-common* installed on each schedulable {product-title} node in your cluster:
  +
  ----
  # yum install ceph-common
  ----
  