StorageGRID requires an ADC service quorum at each site at all times. The ADC service maintains grid topology information and provides configuration services used throughout the grid. StorageGRID therefore prevents the decommissioning of a Storage Node if removing that node would violate the site's ADC quorum requirements.
StorageGRID 12.0 provides a supported Move ADC procedure specifically for situations where an administrator needs to decommission a Storage Node hosting ADC. The ADC service can be moved to another eligible Storage Node within the same site. The target must not already host ADC and must be either a combined Storage Node or metadata-only Storage Node. NetApp performs the operation through the Grid Management private API, using POST /private/move-adc/start; progress can be monitored with GET /private
/move-adc. The dependent IDNT, ACCT, and RSM services move automatically with ADC.
Option B is invalid because ADC runs on eligible Storage Nodes, not Admin Nodes. Option C is incorrect because StorageGRID 12.0 documents the migration through the Grid Management API rather than a CLI relocation command. Option D is unsupported; administrators do not manually reinstall ADC.
Therefore, A is correct.
Reference topics: StorageGRID Maintenance # Move ADC # ADC Quorum # Storage Node Decommission
# Grid Management API