anchor.diff:  [id="migration-preparing-storage"]
   === Storage considerations
   
  -Review the following storage changes to consider when transitioning from {product-title} 3.11 to {product-title} 4.4.
  +Review the following storage changes to consider when transitioning from {product-title} 3.11 to {product-title} 4.5.
   
   [discrete]
   ==== Local volume persistent storage
   
  -Local storage is only supported by using the Local Storage Operator in {product-title} 4.4. It is not supported to use the local provisioner method from {product-title} 3.11.
  +Local storage is only supported by using the Local Storage Operator in {product-title} 4.5. It is not supported to use the local provisioner method from {product-title} 3.11.
   
   For more information, see xref:../../storage/persistent_storage/persistent-storage-local.adoc#persistent-storage-using-local-volume[Persistent storage using local volumes].
   
   [discrete]
   ==== FlexVolume persistent storage
   
  -The FlexVolume plug-in location changed from {product-title} 3.11. The new location in {product-title} 4.4 is `/etc/kubernetes/kubelet-plugins/volume/exec`. Attachable FlexVolume plug-ins are no longer supported.
  +The FlexVolume plug-in location changed from {product-title} 3.11. The new location in {product-title} 4.5 is `/etc/kubernetes/kubelet-plugins/volume/exec`. Attachable FlexVolume plug-ins are no longer supported.
   
   For more information, see xref:../../storage/persistent_storage/persistent-storage-flexvolume.adoc#persistent-storage-using-flexvolume[Persistent storage using FlexVolume].
   
   [discrete]
   ==== Container Storage Interface (CSI) persistent storage
   
  -Persistent storage using the Container Storage Interface (CSI) was link:https://access.redhat.com/support/offerings/techpreview[Technology Preview] in {product-title} 3.11. CSI version 1.1.0 is fully supported in {product-title} 4.4, but does not ship with any CSI drivers. You must install your own driver.
  +Persistent storage using the Container Storage Interface (CSI) was link:https://access.redhat.com/support/offerings/techpreview[Technology Preview] in {product-title} 3.11. CSI version 1.1.0 is fully supported in {product-title} 4.5, but does not ship with any CSI drivers. You must install your own driver.
   
   For more information, see xref:../../storage/container_storage_interface/persistent-storage-csi.adoc#persistent-storage-using-csi[Persistent storage using the Container Storage Interface (CSI)].
   
  
positive.code: 
  toc::[]
  
  Before performing your migration to {product-title} 4.4, it is important to take the time to properly plan for the transition. {product-title} 4 introduces architectural changes and enhancements, so the procedures that you used to manage your {product-title} 3 cluster might not apply for {product-title} 4.
  
  [NOTE]
  ====
  This planning document assumes that you are transitioning from {product-title} 3.11 to {product-title} 4.4.
  ====
  
  ifndef::openshift-origin[]
  
negative.code: 
  To install {product-title} 3.11, you prepared your {op-system-base-full} hosts, set all of the configuration values your cluster needed, and then ran an Ansible playbook to install and set up your cluster.
  
  In {product-title} 4.5, you use the OpenShift installation program to create a minimum set of resources required for a cluster. Once the cluster is running, you use Operators to further configure your cluster and to install new services. After first boot, {op-system-first} systems are managed by the Machine Config Operator (MCO) that runs in the {product-title} cluster.
  
  For more information, see xref:../../architecture/architecture-installation.adoc#installation-process_architecture-installation[Installation process].
  
  ifndef::openshift-origin[]
  If you want to add RHEL worker machines to your {product-title} 4.5 cluster, you use an Ansible playbook to join the RHEL worker machines after the cluster is running. For more information, see xref:../../machine_management/adding-rhel-compute.adoc#adding-rhel-compute[Adding RHEL compute machines to an {product-title} cluster].
  endif::[]
  
  [discrete]
  