红帽全球峰会6.8. CSI automatic migration
In-tree storage drivers that are traditionally shipped with OpenShift Container Platform are being deprecated and replaced by their equivalent Container Storage Interface (CSI) drivers. OpenShift Container Platform provides automatic migration for in-tree volume plugins to their equivalent CSI drivers.
6.8.1. Overview
This feature automatically migrates volumes that were provisioned using in-tree storage plugins to their counterpart Container Storage Interface (CSI) drivers.
This process does not perform any data migration; OpenShift Container Platform only translates the persistent volume object in memory. As a result, the translated persistent volume object is not stored on disk, nor is its contents changed. CSI automatic migration should be seamless. This feature does not change how you use all existing API objects: for example, PersistentVolumes, PersistentVolumeClaims, and StorageClasses.
The following in-tree to CSI drivers are automatically migrated:
- Azure Disk
- OpenStack Cinder
- Amazon Web Services (AWS) Elastic Block Storage (EBS)
- Google Compute Engine Persistent Disk (GCP PD)
- Azure File
- VMware vSphere
CSI migration for these volume types is considered generally available (GA), and requires no manual intervention.
CSI automatic migration of in-tree persistent volumes (PVs) or persistent volume claims (PVCs) does not enable any new CSI driver features, such as snapshots or expansion, if the original in-tree storage plugin did not support it.
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