Start a MinIO rebalance operation to redistribute objects across all server pools for even free space
domain: min.io · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Confirm the user has the `admin:Rebalance` policy action for the deployment (required permission).
Back up cluster settings first with `mc admin cluster bucket export`, `mc admin cluster iam export`, and `mc admin config export`.
Start the operation with `mc admin rebalance start ALIAS` where ALIAS is your MinIO deployment's alias.
Rebalancing scans the entire deployment and moves objects between pools so free space is roughly equal across all pools.
Monitor progress with `mc admin rebalance status ALIAS` and `mc admin trace --call rebalance ALIAS`.
Stop the operation if needed with `mc admin rebalance stop ALIAS`; you can start it again later.
Known gotchas
Rebalance is expensive and time-consuming - run it during light or no use of the deployment.
Writes during rebalance process in parallel and go to a pool NOT actively rebalancing.
MinIO does NOT auto-rebalance when adding a new pool; new objects go to the pool with the most free space until you trigger a manual rebalance.
Rebalancing ignores expired objects (per lifecycle rules) and objects whose only remaining version is a delete marker to avoid moving already-deleted data.
Adding a pool via config reload is rejected while a rebalance is active - stop it first.
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