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Modifying Specifications

If the specifications of a cluster cannot meet business requirements, modify its specifications to improve storage and usage efficiency. You can reduce cluster nodes based on service requirements to optimize the cluster storage at lower O&M costs.

Scaling out Clusters

  1. Log in to the CSS management console.
  2. Click Clusters. Locate the row where the target cluster resides and click Modify in the Operation column.
  3. On the displayed Modify Configuration page, specify New Nodes and Node Storage Capacity.

    If a cluster does not have the master node or client node enabled, you can modify the number of nodes or the node storage capacity. Add at least one node and a maximum of 32 nodes are supported.

    If a cluster has the master node or client node enabled, you can modify the number of master nodes or client nodes, or the node storage capacity. Add at least one node. A maximum of 200 nodes are supported. A maximum of 9 master nodes and 32 client nodes are supported.

    • If you only expand the node quantity, the Node Specifications and Node Storage Capacity settings of newly added nodes are the same as those specified during cluster creation.
    • If you expand both the node quantity and the storage capacity, the Node Specifications settings of newly added nodes are the same as those specified during cluster creation, while the Node Storage Capacity settings of all nodes are changed to the new storage capacity.
    • If you only expand the node storage capacity, the Node Storage Capacity setting of all nodes is changed to the new storage capacity.
    • You can expand the storage capacity six times at most.
    • Services are not interrupted during the cluster scale-out.
    Figure 1 Modifying the cluster specifications
  4. Click Next.
  5. On the displayed Details page, confirm the specifications and click Submit.
  6. Click Back to Cluster List to switch to the Clusters page. If Scaling out is displayed in the Task Status column, the cluster specifications are being modified. If Available is displayed in the Cluster Status column, the modification succeeds.

Scaling in Clusters

  1. Log in to the CSS management console.
  2. Click Clusters. Locate the row where the target cluster resides and click Modify in the Operation column.
  3. On the displayed Modify Configuration page, specify New Nodes.
    • The number of nodes to be scaled in should be less than half of the number of nodes in the target cluster.
    • The number of nodes after scale-in should be greater than the number of replicas.
    • The disk usage after scale-in should be less than 80%.
    • Services are not interrupted during the cluster scale-in.
  4. Click Next.
  5. On the displayed Details page, confirm the specifications and click Submit.
  6. Click Back to Cluster List to switch to the Clusters page. If Scaling in is displayed in the Task Status column, the cluster specifications are being modified. If Available is displayed in the Cluster Status column, the modification succeeds.

Modifying the Node Specifications

  • Only a cluster with three or more nodes can have the node specifications modified.
  • The node specifications can only be scaled up to a higher specification.
  • The cluster created before this function is brought online cannot have node specifications modified.
  • Kibana is unavailable when modifying node specifications.
  • You cannot modify node specifications, node quantity, and node storage capacity at the same time.
  • If the data volume is large, modifying the node specifications may take more time.
  1. Log in to the CSS management console.
  2. Click Clusters. Locate the row where the target cluster resides and click Modify in the Operation column.
  3. On the displayed page, specify New Node Specifications.
  4. Click Next.
  5. On the displayed Details page, confirm the specifications and click Submit.
  6. Click Back to Cluster List to switch to the Clusters page. If Configuration modified is displayed in the Task Status column, the node specifications are being modified. If Available is displayed in the Cluster Status column, the modification succeeds.
Parent topic: Managing Clusters