You can remove hosts from your SDDC as long as the number of hosts in your SDDC cluster remains above the minimum.
The minimum number of hosts for a single availability zone cluster is 3. The minimum number for a multiple availability zone cluster is 6.
Whenever you reduce cluster size, storage latency increases due to process overhead introduced by host removal. The duration of this overhead varies with the amount of data involved. It can take as little as an hour, though an extreme case could require more than 24 hours. While cluster-size reduction (scale-in) is underway, workload VMs supported by the affected clusters can experience significant increases in storage latency.
When you remove a host, VMs running on that host are evacuated to other hosts in the SDDC cluster. The host is placed into maintenance mode and then removed.
Ensure that you have sufficient capacity in your cluster to hold the workload VMs that will be evacuated from the hosts that you remove.
- Log in to the VMC Console at https://vmc.vmware.com.
- Click on your SDDC and then click Summary.
- If the SDDC has only one cluster, select from the SDDC card.
- If the SDDC has more than one cluster, select from the card for the cluster from which you want to remove the hosts.
- Select the number of hosts you want to remove.
If you are removing hosts from a multiple availability zone cluster, you must remove them in multiples of two.Note:
All vSAN storage policies have requirements for a minimum number of hosts. If you attempt to reduce the number of hosts below this minimum, the operation fails. See vSAN Policies in Managing the VMware Cloud on AWS Data Center.
- Select the I understand that this action cannot be undone check box.
- Click Remove.