Decommission (drain and remove) a MinIO server pool with mc admin decommission start and monitor until complete
domain: min.io · 7 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Auth: mc alias with admin credentials and admin decommission privileges on the deployment
Verify remaining pools can absorb the draining pool's data, and list pools: mc admin decommission status myminio
Start the drain using the pool's exact argument string: mc admin decommission start myminio/ https://minio-{01...04}.example.net:9000/mnt/disk{1...4}/minio
Poll overall status: mc admin decommission status myminio; get per-pool progress/ETA by appending the pool string to the status command
Watch for status Draining -> Complete; on Failed, re-run the start command to retry and check mc admin logs plus the systemd journal
After Complete: remove the pool's entry from MINIO_VOLUMES/config on every node and restart all nodes SIMULTANEOUSLY (not rolling)
Official docs: https://min.io/docs/minio/linux/reference/minio-mc-admin/mc-admin-decommission.html and https://docs.min.io/aistor/reference/cli/admin/mc-admin-decommission/
Known gotchas
IRREVERSIBLE: per official docs, once decommissioning begins the pool is marked permanently inactive ('draining'); cancelling or interrupting does not restore it to active
During the drain, reads for not-yet-migrated objects still route to the draining pool, but all new writes go only to remaining pools
Decommission ignores objects that have already lost read quorum (unreadable objects are skipped)
MinIO recommends planning/support review (SUBNET/Engineering) before decommissioning a production pool
The post-completion restart must be simultaneous across all nodes — a rolling restart risks inconsistent cluster state
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