Before you install Mail Security on a Microsoft Exchange cluster
Table: Cluster installation considerations describes the items that you should consider before you install Mail Security in a cluster environment.
Table: Cluster installation considerations
Single copy cluster
Mail Security must be installed on all active and all passive nodes of a cluster.
one Clusterservername (Clusterserverinitials) can run on any cluster node at any time.
If two Clusterserverinitialss try to run on the same node, the results are undefined.
Ensure that the following requirements are met before
you install Mail Security on an Exchange cluster with one or more
There must be an available passive node to fail to. Multiple failovers are supported
only if multiple passive nodes are available.
Mail Security must be installed with the same configuration and in the same
locations on all nodes of the cluster.
Mail Security checks for the presence of a cluster environment during
You are prompted
to register a cluster resource DLL (SMSMSEClusterResource.dll) if the installation is running in a cluster environment. This DLL must
be registered on only one of the cluster nodes.
Mail Security runs on all of the nodes (even passive nodes) immediately after installation.
After the first instance of the cluster resource is configured, the service
runs on only the active node(s).
Clustered continuous replication
You do not need to configure a cluster resource for this type of cluster.
See About installing Mail Security on a Microsoft Cluster