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Scale out a cluster

Last Updated: Oct 12, 2021

If the compute nodes of a High Performance Computing (E-HPC) cluster cannot meet your business requirements, you can scale out the cluster by adding compute nodes.

Prerequisites

  • A vSwitch is available in the region where the scale-out nodes reside. For more information, see Work with vSwitches.

  • Sufficient Elastic Compute Service (ECS) instance quotas exist in the region where the scale-out nodes reside. For more information, see View and increase instance quotas.

Procedure

  1. Log on to the E-HPC console.

  2. In the top navigation bar, select a region.

  3. In the left-side navigation pane, click Cluster.

  4. On the Cluster page, find the cluster that you want to scale out, and click Resize.

  5. In the Resize panel, complete the basic configurations.

    Parameter

    Description

    Zone

    The zone where the scale-out nodes reside. The scale-out nodes and cluster can reside in different zones.

    vSwitch ID

    The ID of an available vSwitch in the specified zone. Unavailable vSwitches are not displayed in the drop-down list.

    The scale-out nodes are deployed in a vSwitch.

    Pricing Model

    • Subscription: You can purchase or renew compute nodes by week, month, or year.

    • Pay-As-You-Go: You are charged for compute nodes on an hourly basis.

    • Preemptible Instance: Preemptible instances are a type of on-demand instances that are offered at a discounted price compared with pay-as-you-go instances.

    For more information, see Overview.

    Quantity of Compute Nodes to be Added

    The number of compute nodes to be added to the cluster. You can add a maximum of 500 compute nodes.

    To add more nodes, submit a ticket.

    Image Type

    The image type of the scale-out nodes.

    Valid values: Public Image, Custom Image, and Share Image.

    Notice

    If you set Image Type to Custom Image, the custom image that you select must be created from compute nodes, not from logon nodes or management nodes. Otherwise, exceptions may occur when you scale out the cluster.

    Image

    Select the image of the scale-out nodes. The image must meet the following conditions:

    • The operating system of the scale-out node image is the same as that of the nodes in the cluster. For example, if the operating system of the nodes in the cluster is CentOS, only a CentOS image can be selected.

      Notice

      If your cluster is a hybrid cloud cluster and it supports general operating systems, you can select a Windows Server image or a CentOS image when the operating system of nodes is Windows.

    • The major version of the scale-out node image is the same as that of the cluster node image. For example, if the version of the cluster node image is CentOS 7.x, the version of the scale-out node image must be CentOS 7.x.

    Assign Public IP Address

    If the scale-out nodes need to access the Internet, you can turn on the switch. Otherwise, the scale-out nodes can access only the resources in the VPC.

    Queue

    The queue of the scale-out nodes. If you do not specify this parameter, the default queue is selected.

    Hostname Prefix and Hostname Suffix

    Specify a prefix and suffix to facilitate node management.

    System Disk

    The system disk size of the scale-out nodes. By default, an ultra disk is used. If no ultra disk is available in the current zone, an SSD disk is used.

  6. Select Alibaba Cloud International Website Product Terms of Service and click Buy Now.

Result

After you scale out the cluster, the added compute nodes automatically install and initialize the cluster application. The original compute nodes are not affected. To query the status of scale-out nodes, choose Resource Management > Nodes in the left-side navigation pane. Select the cluster that you scaled out from the Cluster drop-down list. Select Compute Node from the Node Type drop-down list. If the nodes are in the Running state, the cluster is scaled out.