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doc: add/mark the in-tree migration path to deprecation #4221

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doc: add/mark the in-tree migration path to deprecation #4221

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18 changes: 17 additions & 1 deletion docs/intree-migrate.md
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# In-tree storage plugin to CSI Driver Migration
# In-tree storage plugin to CSI Driver Migration [DEPRECATED]

:warning: **The functionality mentioned, regarding the migration of
PVCs (Persistent Volume Claims) from the in-tree provisioner of Kubernetes to
Ceph CSI Volumes, has been deprecated as of
[Kubernetes v1.28](https://kubernetes.io/docs/concepts/storage/volumes/#rbd-csi-migration)
This means that the below suggested method of migration of volumes
provisioned by `kubernetes.io/rbd` provisioner to Ceph CSI provisioner
approach is no longer recommended. To assist in converting volumes from the
old provisioner to Ceph CSI Volumes, a utility is available. You can access
this utility by visiting
[this](https://github.com/ceph/persistent-volume-migrator). This utility has
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The migration tool talks abouts migrating from flex to csi (more specifically Rook and CSI) it doesn't mention about in-tree in the Readme doc

been developed to facilitate the migration process and ensure a smoother
transition from in-tree and flex provisioner volumes to Ceph CSI provisioner
Volumes. It's essential to follow the updated recommendations and utilize
the provided utility for a successful migration due to the deprecation of
the method described in this document.**

This document covers the example usage of in-tree RBD storage plugin to CSI
migration feature which can be enabled in a Kubernetes cluster. At present, this
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