Each site in a StorageGRID deployment can have one or more Admin Nodes.
What an Admin Node is
Admin Nodes provide management services such as system configuration, monitoring, and logging. Each grid must have one primary Admin Node and might have any number of non-primary Admin Nodes for redundancy.
Using multiple Admin Nodes
A StorageGRID system can include multiple Admin Nodes to enable you to continuously monitor and configure your StorageGRID system even if one Admin Node fails.
Identifying the primary Admin Node
The primary Admin Node hosts the CMN service. Some maintenance procedures can only be performed using the primary Admin Node.
Selecting a preferred sender
If your StorageGRID deployment includes multiple Admin Nodes, you can select which Admin Node should be the preferred sender of AutoSupport messages and email and SNMP notifications for alerts and alarms (legacy system). By default, the primary Admin Node is selected, but any Admin Node can be the preferred sender.
Viewing notification status and queues
The NMS service on Admin Nodes sends notifications to the mail server. You can view the current status of the NMS service and the size of its notifications queue on the Interface Engine page.
How Admin Nodes show acknowledged alarms (legacy system)
When you acknowledge an alarm on one Admin Node, the acknowledged alarm is not copied to any other Admin Node. Because acknowledgments are not copied to other Admin Nodes, the Grid Topology tree might not look the same for each Admin Node.
Configuring audit client access
The Admin Node, through the Audit Management System (AMS) service, logs all audited system events to a log file available through the audit share, which is added to each Admin Node at installation. For easy access to audit logs, you can configure client access to audit shares for both CIFS and NFS.