After you upgrade vSphere, change the admission control of the management cluster in Region A to use the number of hosts to tolerate setting according to this validated design.

vSphere 6.5 or later introduces an admission control policy that directly uses a number of host failures to tolerate to adjust the CPU and memory resources for virtual machine availability in the cluster.

Procedure

  1. Log in to the Management vCenter Server by using the vSphere Web Client.
    1. Open a Web browser and go to https://mgmt01vc01.sfo01.rainpole.local/vsphere-client.
    2. Log in using the following credentials.

      Setting

      Value

      User name

      administrator@vsphere.local

      Password

      vsphere_admin_password

  2. In the Navigator, click Host and Clusters.
    1. Expand the mgmt01vc01.sfo01.rainpole.local inventory.
    2. Select the SFO01-Mgmt01 cluster under the SFO01 data center.
  3. Click the Configure tab and click vSphere Availability.
  4. Click Edit.
  5. In the Edit Cluster Settings dialog box, click Admission Control under vSphere Availability, enter the following settings and click OK.

    Setting

    Value

    Host failures cluster tolerates

    1

    Define host failover capacity by

    Cluster resource percentage

    Override calculated failover capacity

    Deselected

    Performance degradation VMs tolerate

    100%