OSDOCS-2448: Auto Migration for Azure File

Author: Lisa Pettyjohn

modules/persistent-storage-csi-migration-enable.adoc

@@ -31,7 +31,7 @@ spec:
   featureSet: TechPreviewNoUpgrade <1>
 ...
 ----
-<1> Enables automatic migration for AWS EBS, Cinder, and Azure Disk.
+<1> Enables automatic migration for AWS EBS, Cinder, Azure Disk, and Azure File.
 +
 You can specify CSI automatic migration for a selected CSI driver by setting `CustomNoUpgrade` `featureSet` and for `featuregates` to one of the following:
 +
@@ -42,6 +42,8 @@ You can specify CSI automatic migration for a selected CSI driver by setting `Cu
 
 * CSIMigrationAzure
 
+* CSIMigrationAzureFile
+
 * CSIMigrationGCE
 --
 +

modules/persistent-storage-csi-migration-overview.adoc

@@ -15,6 +15,8 @@ The following drivers are supported:
 
 * Azure Disk
 
+* Azure File
+
 * Google Compute Engine Persistent Disk (in-tree) and Google Cloud Platform Persistent Disk (CSI)
 
 CSI automatic migration should be seamless. Enabling this feature does not change how you use all existing API objects (for example, `PersistentVolumes`, `PersistentVolumeClaims`, and `StorageClasses`).

storage/persistent_storage/persistent-storage-azure-file.adoc

@@ -27,6 +27,13 @@ storage provider.
 Azure File volumes use Server Message Block.
 ====
 
+[IMPORTANT]
+====
+In future {product-title} versions, volumes provisioned using existing in-tree plug-ins are planned for migration to their equivalent CSI driver. CSI automatic migration should be seamless. Migration does not change how you use all existing API objects, such as persistent volumes, persistent volume claims, and storage classes. For more information about migration, see xref:../../storage/container_storage_interface/persistent-storage-csi-migration.adoc#persistent-storage-csi-migration[CSI automatic migration].
+
+After full migration, in-tree plug-ins will eventually be removed in future versions of {product-title}.
+====
+
 .Additional resources
 
 * link:https://azure.microsoft.com/en-us/services/storage/files/[Azure Files]