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Scenario #354
Storage
Kubernetes v1.26, in-tree to CSI migration
In-Tree Plugin PVs Lost After Driver Migration
Existing in-tree volumes became unrecognized after enabling CSI migration.
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What Happened
Migrated GCE volumes to CSI plugin. Old PVs had legacy annotations and didn’t bind correctly.
Diagnosis Steps
- 1PVs showed Unavailable state.
- 2Migration feature gates enabled but missing annotations.
Root Cause
Backward incompatibility in migration logic for pre-existing PVs.
Fix/Workaround
• Manually edited PV annotations to match CSI requirements.Lessons Learned
Migration feature gates must be tested in staging.
How to Avoid
- 1Run migration with shadow mode first.
- 2Migrate PVs gradually using tools like pv-migrate.