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Doc update for Persistent Volumes #47282

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Doc update for Persistent Volumes #47282

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18 changes: 13 additions & 5 deletions content/en/docs/concepts/storage/persistent-volumes.md
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Original file line number Diff line number Diff line change
Expand Up @@ -253,12 +253,15 @@ However, the particular path specified in the custom recycler Pod template in th
Finalizers can be added on a PersistentVolume to ensure that PersistentVolumes
having `Delete` reclaim policy are deleted only after the backing storage are deleted.

The newly introduced finalizers `kubernetes.io/pv-controller` and
`external-provisioner.volume.kubernetes.io/finalizer`
are only added to dynamically provisioned volumes.
The finalizer `external-provisioner.volume.kubernetes.io/finalizer`(introduced
in v1.31) is added to both dynamically provisioned and statically provisioned
CSI volumes.

The finalizer `kubernetes.io/pv-controller` is added to in-tree plugin volumes.
The following is an example
The finalizer `kubernetes.io/pv-controller`(introduced in v1.31) is added to
dynamically provisioned in-tree plugin volumes and skipped for statically
provisioned in-tree plugin volumes.

The following is an example of dynamically provisioned in-tree plugin volume:

```shell
kubectl describe pv pvc-74a498d6-3929-47e8-8c02-078c1ece4d78
Expand Down Expand Up @@ -317,6 +320,11 @@ When the `CSIMigration{provider}` feature flag is enabled for a specific in-tree
the `kubernetes.io/pv-controller` finalizer is replaced by the
`external-provisioner.volume.kubernetes.io/finalizer` finalizer.

The finalizers ensure that the PV object is removed only after the volume is deleted
from the storage backend provided the reclaim policy of the PV is `Delete`. This
also ensures that the volume is deleted from storage backend irrespective of the
order of deletion of PV and PVC.

### Reserving a PersistentVolume

The control plane can [bind PersistentVolumeClaims to matching PersistentVolumes](#binding)
Expand Down