Expand a MinIO deployment by adding a new server pool (config hot-reload or MINIO_VOLUMES restart method)
domain: min.io · 8 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Auth: root/sudo on every node for config + systemd changes; mc alias with admin credentials for verification commands
Stop any active rebalance first: mc admin rebalance status myminio, then mc admin rebalance stop myminio if one is running
Verify the new pool's erasure-set layout matches existing EC parity/stripe requirements (use MinIO's Erasure Code Calculator) before provisioning
Hot-reload method (MinIO RELEASE.2026-02-02T23-40-11Z or later): append the new pool under the pools: array in config, copy the identical file to every node, systemctl start minio on new nodes, then systemctl reload minio on existing nodes
Legacy method (older releases): append the new pool endpoints to MINIO_VOLUMES on every node, then simultaneously run mc admin service restart myminio for existing nodes and systemctl start minio on new nodes
Verify the pool is recognized: mc admin info myminio; tail journalctl -u minio -f; update load balancers only after the cluster is healthy
To redistribute existing data onto the new pool, separately run mc admin rebalance start myminio
Official docs: https://docs.min.io/enterprise/aistor-object-store/operations/scaling/expansion/expand-aistor-linux/
Known gotchas
The no-full-restart (config hot-reload) expansion path requires MinIO RELEASE.2026-02-02T23-40-11Z or later; older versions must use MINIO_VOLUMES + full simultaneous restart
New pools must satisfy the same erasure-set/parity requirements as existing pools or the expansion is rejected
Never do a rolling one-node-at-a-time restart during expansion — all nodes must restart simultaneously
Every MINIO_VOLUMES pool URL needs an explicit http/https scheme and all pools must use matching protocols
Expansion alone does not rebalance existing data — new pools just get proportionally more new writes until you run mc admin rebalance
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