Scaling Out a Cluster

Prerequisites

• The target cluster is available and has no tasks in progress.
• The target cluster has sufficient quotas available.

Constraints

• Node specifications cannot be modified during cluster scale-out.
• If you change the number and storage capacity of a specified type of node, nodes in other types will not be changed.
• The quota of nodes in different types varies. For details, see Table 1.

  Table 1 Number of nodes in different types

  Node Type	Number
  ess	ess: 1-32
  ess, ess-master	ess: 1-200 ess-master: an odd number ranging from 3 to 9
  ess, ess-client	ess: 1-32 ess-client: 1-32
  ess, ess-cold	ess: 1-32 ess-cold: 1-32
  ess, ess-master, ess-client	ess: 1-200 ess-master: an odd number ranging from 3 to 9 ess-client: 1-32
  ess, ess-master, ess-cold	ess: 1-200 ess-master: an odd number ranging from 3 to 9 ess-cold: 1-32
  ess, ess-client, ess-cold	ess: 1-32 ess-client: 1-32 ess-cold: 1-32
  ess, ess-master, ess-client, ess-cold	ess: 1-200 ess-master: an odd number ranging from 3 to 9 ess-client: 1-32 ess-cold: 1-32
  Details about the four node types: ess: the default node type that is mandatory for cluster creation. The other three node types are optional. ess-master: master node ess-client: client node ess-cold: cold data node

Procedure

1. Log in to the CSS management console.
2. In the navigation pane on the left, choose Clusters > Elasticsearch. On the displayed Clusters page, locate the target cluster and choose More > Modify Configuration in the Operation column.
3. On the Modify Configuration page, choose the Scale Cluster tab and click Scale out to set parameters.
   • New Nodes: The number of default nodes. For details about the quota, see Table 1.
   • Node Storage Capacity: The storage capacity of the default nodes. The quota is determined by the New Node Specifications. The value must be a multiple of 20.
   

   If a cluster has master, client, or cold data nodes, you can change the number of these nodes and expand the storage capacity of cold data nodes. For details about the quotas of the master, client, and cold data node, see Table 1.

   Figure 1 Scaling out a cluster
   
4. Click Next: Scale Now.
5. Confirm the information and click Submit.
6. Click Back to Cluster List to switch to the Clusters page. The Task Status is Scaling out. When Cluster Status changes to Available, the cluster has been successfully scaled out.