Upgrade a single-site cluster containing multiple MSM VMs

Upgrade one data center environment with multiple MSM VMs, each associated with up to two Core VMs.

About this task

The following figure is an example of a single-site cluster with multiple MSM VMs:

When performing the classic upgrade, you can upgrade the Core VM associated with MSM VMs in the cluster simultaneously. Identify the MSM VM acting as the Cassandra seed node and determine the MSM VM with which to start the upgrade.

Once the upgrade process begins, do not:
  • Add any Core VMs to any MSM VMs in the cluster.
  • Join any additional MSM VMs to the MSM VM cluster.

After an MSM VM in a cluster is upgraded, exceptions might be displayed in the /opt/vce/multivbmgmt/logs/CollectionManager.log until all MSM VMs are upgraded. Collections can temporarily fail on all MSM VMs until they are upgraded. Until both data centers are upgraded, an MSM VM upgrade in one data center impacts collections by MSM VMs running in the other data center.