Adding disks to storage nodes

You can add disks to local storage nodes to expand Fusion Data Foundation capacity. IBM Fusion auto detects the added local device and auto expands the capacity to Fusion Data Foundation storage cluster.

About this task

If you deployed with less than three zones enabling the flexible scale deployment, add any number of disks to scale up. Unlike Internal (Dynamic Provisioning) mode deployment, there is no constraint to scale up by three disks at a time.

Procedure

  1. Ensure that the devices to be added to the storage nodes are the same size and type as the existing Fusion Data Foundation devices.
  2. Run the following command to check Fusion Data Foundation replica number: 
    oc get storagecluster -n openshift-storage -o yaml | grep replica

    If replica is 1, it means that Fusion Data Foundation flexible scaling is auto enabled in a OpenShift® Container Platform with less than 3 zones. In flexible scaling mode, you could add any number of disks to any storage node. But the recommendation is to add disk number in multiples of 3 to node number in multiple of 3. These added disks must be evenly distributed in these nodes.

    If replica is 3, this means that Fusion Data Foundation is not in flexible scaling mode. In such case, you must add disk number in multiple of 3 to storage node number in multiple of 3. Also, these disks and nodes must be evenly distributed in different zones.

  3. Add disks to storage nodes and wait for Fusion Data Foundation capacity to be auto scaled up.