Start decommissioning a MinIO server pool with mc admin decommission start
domain: min.io · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
List every pool on the deployment to derive the exact TARGET: mc admin decommission status ALIAS (no TARGET)
Form the TARGET: classic deployments use the full pool spec e.g. https://minio-{01...04}.example.net:9000/mnt/disk{1...4}; config.yaml deployments expose pools as hash:<hex> identifiers (use the full hash string)
Start the migration: mc admin decommission start ALIAS TARGET
Confirm the user has the required admin permission and monitor progress with mc admin decommission status ALIAS TARGET
Objects are migrated automatically to remaining pools proportionally to each pool's free space; unreadable objects (lost read quorum) are skipped
Known gotchas
Always derive TARGET from the live status output - a stale or changed pool spec fails or targets the wrong pool
Back up cluster settings first (mc admin config export, mc admin cluster bucket export, mc admin cluster iam export) so you can recover from errors
Decommission is designed for removing an older/outperformed pool; data moves based on free-space ratio across remaining pools
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