Scaling Out a Cluster¶
If the workloads on the data plane of a cluster change, you can scale out the cluster by increasing the number or capacity of its nodes. Services are not interrupted during cluster scale-out.
Prerequisites¶
The target cluster is available and has no tasks in progress.
The target cluster has sufficient quotas available.
Constraints¶
The Node Specifications cannot be modified during scale-out. You can modify Node Specifications by referring to Changing Specifications.
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¶
Log in to the CSS management console.
In the navigation pane, choose a cluster type. The cluster management page is displayed.
Choose More > Modify Configuration in the Operation column of the target cluster. The Modify Configuration page is displayed.
On the Modify Configuration page, choose the Scale Cluster tab and click Scale out to set parameters.
Action: Select Scale out.
Resource: The changed amount of resources.
Nodes: The number of nodes and node storage capacity of the default data node.
Nodes: For details, see Table 1.
The value range of Node Storage Type depends on the Node Specifications. The value must be a multiple of 20.
Click Next.
Confirm the information and click Submit.
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.