To pause the database — that is stop client activity through the client port when performing certain administrative functions — you set the property cluster.clusterSpec.maintenanceMode to true. For example, the following commands pause and then resume the database associated with release mydb:

$ helm upgrade mydb voltdb/voltdb       \
   --reuse-values                       \
   --set cluster.clusterSpec.maintenanceMode=true

$ helm upgrade mydb voltdb/voltdb       \
   --reuse-values                       \
   --set cluster.clusterSpec.maintenanceMode=false