Topic Last Modified: 2008-08-26
The Microsoft Exchange Analyzer Tool queries the Active Directory directory service to determine the value of the msExchClusterStorageType attribute of the Mailbox server objects.
A value of 1 for the msExchClusterStorageType attribute indicates that the clustered mailbox server is hosted in a Cluster continuous replication (CCR) environment, and a value of 2 indicates that the clustered mailbox server is in a Single copy cluster (SCC). A value of <Not Set> indicates that the Mailbox server is a stand-alone server.
The Exchange Server Analyzer then queries the QuorumType property of the MSCluster_Cluster Microsoft Windows® Management Instrumentation (WMI) class to determine whether the quorum type set is Node Majority or not.
Finally, the Exchange Server Analyzer queries the MSCluster_Resource (WMI) class to determine whether the quorum resource has been defined as a shared disk quorum.
The quorum resource allows the cluster to maintain its state and configuration independently of individual node failures. The quorum resource stores a constantly-updated version of the cluster database and is accessible to all cluster nodes.
A shared disk quorum uses a quorum log file that is located on a disk hosted on a shared storage interconnect that is accessible by all members of the cluster.
If the Exchange Server Analyzer determines that all of the following conditions exist, the Exchange Server Analyzer displays a warning:
- The cluster type is Cluster continuous replication (CCR).
- The quorum type is not set to Node Majority.
- The quorum resource is a shared disk quorum.
The use of a shared disk quorum in a Cluster continuous replication (CCR) environment is not a recommended best practice.
- For Windows Server 2008, the recommended quorum is
called a Node and File Share Majority quorum. For detailed
steps about how to configure a failover cluster to use the Node and
File Share Majority quorum model, see How t o Configure the Node and File Share Majority
- For Windows Server 2003, the recommended quorum is
called a Majority Node Set (MNS) quorum with file share
witness. This quorum model is available in
Windows Server 2003 Service Pack 2 (SP2). It is also
available in a hotfix for Windows Server 2003 SP1
described in Microsoft Knowledge Base article 921181, An update is available that adds a file share
witness feature and a configurable cluster heartbeats feature to
Windows Server 2003 Service Pack 1-based server clusters;
however, Exchange 2007 SP1 requires
Windows Server 2003 Service Pack 2.