Troubleshooting Low object data storage alerts

The Low object data storage alert monitors how much space is available for storing object data on each Storage Node. It is related to the Storage Status (SSTS) alarm, but it is not exactly equivalent.

Before you begin

About this task

The Low object data storage is triggered when the total amount of replicated and erasure coded object data on a Storage Node meets one of the conditions configured in the alert rule.

By default, a major alert is triggered when this condition evaluates as true:

(storagegrid_storage_utilization_data_bytes + storagegrid_storage_utilization_usable_space_bytes)) >=0.90
In this condition:
  • storagegrid_storage_utilization_data_bytes is an estimate of the total size of replicated and erasure coded object data for a Storage Node.
  • storagegrid_storage_utilization_usable_space_bytes is the total amount of object storage space remaining for a Storage Node.

If a major or minor Low object data storage alert is triggered, you should perform an expansion procedure as soon as possible.


  1. Select Alarms. Then, in the Alerts (Preview) section of the menu, select Alerts.
    The Alerts page appears.
  2. From the table of alerts, expand the Low object data storage alert group, if required, and select the alert you want to view.
    Note: Select the alert, not the heading for a group of alerts.
  3. Review the details in the dialog box, and note the following:
    • Time triggered
    • The name of the site and node
    • The current values of the metrics for this alert
  4. Select Nodes > Storage_Node or Site > Storage.
  5. Hover your cursor over the Storage Used - Object Data graph.
    A pop-up displays Used (%), Used, and Total capacities. The Used value is the storagegrid_storage_utilization_data_bytes metric.
    Storage Used - Object Data Graph
  6. Select the time controls above the graph to view storage use over different time periods.
    Looking at storage use over time can help you understand how much storage was used before and after the alert was triggered and can help you estimate how long it might take for the node's remaining space to become full.
  7. As soon as possible, perform an expansion procedure to add storage capacity.

    You can add storage volumes (LUNs) to existing Storage Nodes, or you can add new Storage Nodes.

    Note: To manage a full Storage Node, see the instructions for administering StorageGRID.