Run a deep-scan heal on MinIO objects to catch silent bit rot with mc admin heal --scan deep
domain: min.io · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Create or confirm an admin alias: mc alias set ALIAS http://SERVER:9000 ACCESS_KEY SECRET_KEY (secret key >= 8 chars). mc admin heal requires a user with administrative privileges.
Run a deep scan heal on a bucket or prefix: mc admin heal --scan deep --recursive ALIAS/BUCKET
--scan deep forces a thorough data-integrity scan (full object checksumming) rather than the default lightweight check; add --recursive (-r) to walk every object under the target.
Read the Summary block: objects healed (count/size), objects failed, heal rate, offline disk count, and sets exceeding parity tolerance.
Official docs: https://docs.min.io/aistor/reference/cli/admin/mc-admin-heal/
Known gotchas
--scan accepts one of normal, deep, or uncommitted; deep detects silent bit rot by verifying full object data.
Deep scans are resource intensive. MinIO normally auto-heals on each POST/GET and via the background scanner, so a manual deep scan is rarely required even after corruption.
mc admin heal works only on MinIO/AIStor deployments, not arbitrary S3-compatible services.
Requires an admin alias (root or an admin-policy holder). If the target already has an active scan, the command returns that scan's status instead of starting a new one.
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